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BUG: pandas.to_datetime() does not respect exact format string with ISO8601 #49333

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Merged
merged 26 commits into from
Nov 17, 2022
Merged

BUG: pandas.to_datetime() does not respect exact format string with ISO8601 #49333

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45f82c3
initial format support
nikitaved Oct 26, 2022
e473adb
set exact=False default in objects_to_datetime
Oct 28, 2022
a6ea6d0
:label: typing
Oct 28, 2022
8fede1f
simplify
Oct 28, 2022
2e21e71
Merge remote-tracking branch 'upstream/main' into pr/nikitaved-qssumm…
Oct 28, 2022
afc4d96
Merge remote-tracking branch 'upstream/main' into pr/nikitaved/qssumm…
Oct 30, 2022
12721b0
replace macro with function
Oct 30, 2022
0531967
clean up
Oct 30, 2022
a571753
:memo: restore docstring
Oct 30, 2022
e814a2e
inline
Oct 30, 2022
19c34f8
set format default to None
Oct 31, 2022
70fb820
Merge remote-tracking branch 'upstream/main' into pr/nikitaved/qssumm…
Oct 31, 2022
eb50dfb
clean up
Oct 31, 2022
ac61ac5
Merge remote-tracking branch 'upstream/main' into pr/nikitaved/qssumm…
Nov 6, 2022
0dd7407
remove function, perform check inline
Nov 6, 2022
4d35ea7
Merge remote-tracking branch 'upstream/main' into pr/nikitaved/qssumm…
Nov 7, 2022
3acfdf6
only compare *format++ if format_len
Nov 7, 2022
f3060c9
clean up
Nov 7, 2022
7310e13
typing
Nov 7, 2022
b18ade7
Merge remote-tracking branch 'upstream/main' into pr/nikitaved/qssumm…
Nov 9, 2022
3ceb1ee
split out branches
Nov 9, 2022
bde5ef9
Merge remote-tracking branch 'upstream/main' into pr/nikitaved/qssumm…
Nov 13, 2022
080f018
use compare_format function
Nov 13, 2022
031e0e3
remove tmp variable
Nov 13, 2022
01e8bd1
Merge remote-tracking branch 'upstream/main' into pr/nikitaved/qssumm…
Nov 17, 2022
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v2.0.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -333,6 +333,7 @@ Conversion
- Bug in :meth:`Series.convert_dtypes` not converting dtype to nullable dtype when :class:`Series` contains ``NA`` and has dtype ``object`` (:issue:`48791`)
- Bug where any :class:`ExtensionDtype` subclass with ``kind="M"`` would be interpreted as a timezone type (:issue:`34986`)
- Bug in :class:`.arrays.ArrowExtensionArray` that would raise ``NotImplementedError`` when passed a sequence of strings or binary (:issue:`49172`)
- Bug in :func:`to_datetime` was not respecting ``exact`` argument when ``format`` was an ISO8601 format (:issue:`12649`)

Strings
^^^^^^^
Expand Down
2 changes: 2 additions & 0 deletions pandas/_libs/tslib.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@ def array_to_datetime(
utc: bool = ...,
require_iso8601: bool = ...,
allow_mixed: bool = ...,
format: str = ...,
exact: bool = ...,
) -> tuple[np.ndarray, tzinfo | None]: ...

# returned ndarray may be object dtype or datetime64[ns]
17 changes: 14 additions & 3 deletions pandas/_libs/tslib.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ def _test_parse_iso8601(ts: str):
elif ts == 'today':
return Timestamp.now().normalize()

string_to_dts(ts, &obj.dts, &out_bestunit, &out_local, &out_tzoffset, True)
string_to_dts(ts, &obj.dts, &out_bestunit, &out_local, &out_tzoffset, True, "", False)
obj.value = npy_datetimestruct_to_datetime(NPY_FR_ns, &obj.dts)
check_dts_bounds(&obj.dts)
if out_local == 1:
Expand Down Expand Up @@ -445,6 +445,8 @@ cpdef array_to_datetime(
bint utc=False,
bint require_iso8601=False,
bint allow_mixed=False,
str format="",
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Can you use None as a default rather than ""? I think can just type as Optional[str] which would be a bit cleaner

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Sure, could do that here, but then wouldn't it still need to be str when it's passed to the C function in

pandas/pandas/_libs/tslibs/np_datetime.pyx

Lines 287 to 290 in 45f82c3

format_buf = get_c_string_buf_and_size(format, &format_length)
return parse_iso_8601_datetime(buf, length, want_exc,
dts, out_bestunit, out_local, out_tzoffset,
format_buf, format_length, exact)

? If I understand correctly, at some point the conversion from None to "" would have to happen anyway

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@nikitaved nikitaved Oct 31, 2022 •
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If None can be interpreted as nullptr (can we just pass 0?), I agree that having None is a cleaner option for something that is user-facing.

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This isn't user-facing, it's just used internally

Not sure I understand about None being interpreted as nullptr, but if I pass None to get_c_string_buf_and_size I get

Traceback (most recent call last):
  File "t.py", line 109, in <module>
    print(to_datetime('2012-01-01T10:00', format='%Y-%m-%dT%H:%M', exact=False))
  File "/home/marcogorelli/pandas-dev/pandas/core/tools/datetimes.py", line 1117, in to_datetime
    result = convert_listlike(np.array([arg]), format)[0]
  File "/home/marcogorelli/pandas-dev/pandas/core/tools/datetimes.py", line 441, in _convert_listlike_datetimes
    result, tz_parsed = objects_to_datetime64ns(
  File "/home/marcogorelli/pandas-dev/pandas/core/arrays/datetimes.py", line 2177, in objects_to_datetime64ns
    result, tz_parsed = tslib.array_to_datetime(
  File "pandas/_libs/tslib.pyx", line 440, in pandas._libs.tslib.array_to_datetime
    cpdef array_to_datetime(
  File "pandas/_libs/tslib.pyx", line 706, in pandas._libs.tslib.array_to_datetime
    raise
  File "pandas/_libs/tslib.pyx", line 606, in pandas._libs.tslib.array_to_datetime
    string_to_dts_failed = string_to_dts(
  File "pandas/_libs/tslibs/np_datetime.pyx", line 288, in pandas._libs.tslibs.np_datetime.string_to_dts
    format_buf = get_c_string_buf_and_size(None, &format_length)
  File "pandas/_libs/tslibs/util.pxd", line 221, in pandas._libs.tslibs.util.get_c_string_buf_and_size
    return PyUnicode_AsUTF8AndSize(py_string, length)
TypeError: bad argument type for built-in operation

So I think the conversion between None and str needs to happen at some point internally anyway

If exact if False and format is '', then it should match anything

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@nikitaved nikitaved Oct 31, 2022 •
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What about?

if format is None:
  # Make format_buf a nullptr
  format_buf = 0
  format_lenght = 0
else:
  format_buf = get_c_string_buf_and_size(..., &format_length)
...

return parse_iso...

The rest of the code should work just fine given that the checks are conditioned on format_lenght.

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OK yeah, looks good - I presume format_buf would have to be '\0' rather than 0 though?

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@nikitaved nikitaved Oct 31, 2022 •
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As long as format_len is 0, *format_buf could be anything, so it is a bit clearer to have the pointer set to NULL, imho.

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@MarcoGorelli MarcoGorelli Oct 31, 2022 •
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how though? because if it's 0, then we get

[1/1] Cythonizing pandas/_libs/tslibs/np_datetime.pyx

Error compiling Cython file:
------------------------------------------------------------
...

    buf = get_c_string_buf_and_size(val, &length)
    format_buf = get_c_string_buf_and_size(format, &format_length)
    return parse_iso_8601_datetime(buf, length, want_exc,
                                   dts, out_bestunit, out_local, out_tzoffset,
                                   0, 0, exact)
                                  ^
------------------------------------------------------------

pandas/_libs/tslibs/np_datetime.pyx:290:35: Cannot assign type 'long' to 'const char *'

And with None:

Error compiling Cython file:
------------------------------------------------------------
...

    buf = get_c_string_buf_and_size(val, &length)
    format_buf = get_c_string_buf_and_size(format, &format_length)
    return parse_iso_8601_datetime(buf, length, want_exc,
                                   dts, out_bestunit, out_local, out_tzoffset,
                                   None, 0, exact)
                                  ^
------------------------------------------------------------

pandas/_libs/tslibs/np_datetime.pyx:290:35: Cannot assign None to const char *

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@nikitaved nikitaved Oct 31, 2022 •
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Ah, I see, it is a cast issue. Does Cython support casts to C types? If so, something like format_buf = (const char*) 0 should do. Or, maybe, we can specify the type of format_buf in advance... Sorry, I am not an expert in Cython :)
Maybe this will work?

if format is None:
  format_buf: const char* = 0
  format_len = 0
else:
  format_buf = get_c_string_buf_and_size(val, &format_len)

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I've tried

format_buf = <const char*> 0

but then get

Segmentation fault

(with no further info)

For now I've gone with format = b'', and handling None inside this function does indeed look cleaner, thanks!

bint exact=False,
):
"""
Converts a 1D array of date-like values to a numpy array of either:
Expand Down Expand Up @@ -564,6 +566,15 @@ cpdef array_to_datetime(
iresult[i] = get_datetime64_nanos(val, NPY_FR_ns)

elif is_integer_object(val) or is_float_object(val):
if require_iso8601:
if is_coerce:
iresult[i] = NPY_NAT
continue
elif is_raise:
raise ValueError(
f"time data \"{val}\" at position {i} doesn't match format \"{format}\""
)
return values, tz_out
# these must be ns unit by-definition
seen_integer = True

Expand Down Expand Up @@ -594,7 +605,7 @@ cpdef array_to_datetime(

string_to_dts_failed = string_to_dts(
val, &dts, &out_bestunit, &out_local,
&out_tzoffset, False
&out_tzoffset, False, format, exact
)
if string_to_dts_failed:
# An error at this point is a _parsing_ error
Expand All @@ -609,7 +620,7 @@ cpdef array_to_datetime(
continue
elif is_raise:
raise ValueError(
f"time data \"{val}\" at position {i} doesn't match format specified"
f"time data \"{val}\" at position {i} doesn't match format \"{format}\""
)
return values, tz_out

Expand Down
2 changes: 1 addition & 1 deletion pandas/_libs/tslibs/conversion.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -488,7 +488,7 @@ cdef _TSObject _convert_str_to_tsobject(object ts, tzinfo tz, str unit,
else:
string_to_dts_failed = string_to_dts(
ts, &dts, &out_bestunit, &out_local,
&out_tzoffset, False
&out_tzoffset, False, "", False
)
if not string_to_dts_failed:
try:
Expand Down
2 changes: 2 additions & 0 deletions pandas/_libs/tslibs/np_datetime.pxd
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,8 @@ cdef int string_to_dts(
int* out_local,
int* out_tzoffset,
bint want_exc,
str format,
bint exact
) except? -1

cdef NPY_DATETIMEUNIT get_unit_from_dtype(cnp.dtype dtype)
Expand Down
11 changes: 9 additions & 2 deletions pandas/_libs/tslibs/np_datetime.pyx
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Expand Up @@ -52,7 +52,8 @@ cdef extern from "src/datetime/np_datetime_strings.h":
int parse_iso_8601_datetime(const char *str, int len, int want_exc,
npy_datetimestruct *out,
NPY_DATETIMEUNIT *out_bestunit,
int *out_local, int *out_tzoffset)
int *out_local, int *out_tzoffset,
const char *format, int format_len, int exact)


# ----------------------------------------------------------------------
Expand Down Expand Up @@ -273,14 +274,20 @@ cdef inline int string_to_dts(
int* out_local,
int* out_tzoffset,
bint want_exc,
str format,
bint exact,
) except? -1:
cdef:
Py_ssize_t length
const char* buf
Py_ssize_t format_length
const char* format_buf

buf = get_c_string_buf_and_size(val, &length)
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Orthogonal to this but if you want to work more with the C codebase I think we should just replace get_c_string_buf_and_size with PyUnicode_AsUTF8AndSize directly; the former might have served a purpose with the Py2/3 transition but is just an unnecessary layer at this point

format_buf = get_c_string_buf_and_size(format, &format_length)
return parse_iso_8601_datetime(buf, length, want_exc,
dts, out_bestunit, out_local, out_tzoffset)
dts, out_bestunit, out_local, out_tzoffset,
format_buf, format_length, exact)


cpdef ndarray astype_overflowsafe(
Expand Down
2 changes: 1 addition & 1 deletion pandas/_libs/tslibs/parsing.pyx
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Expand Up @@ -409,7 +409,7 @@ cdef parse_datetime_string_with_reso(
# TODO: does this render some/all of parse_delimited_date redundant?
string_to_dts_failed = string_to_dts(
date_string, &dts, &out_bestunit, &out_local,
&out_tzoffset, False
&out_tzoffset, False, "", False
)
if not string_to_dts_failed:
if dts.ps != 0 or out_local:
Expand Down
69 changes: 67 additions & 2 deletions pandas/_libs/tslibs/src/datetime/np_datetime_strings.c
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Expand Up @@ -66,10 +66,24 @@ This file implements string parsing and creation for NumPy datetime.
*
* Returns 0 on success, -1 on failure.
*/

#define FORMAT_STARTSWITH(ch) \
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Can you make this a function instead of a macro?

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@nikitaved nikitaved Oct 29, 2022 •
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The macro modifies two variables and has access to the goto location. A separate function then has to have at least two variables accepted with one of them being a pointer to a pointer. It also has to return a flag that needs a check every single time it is called. We can remove this pointer to a pointer, however, and modify just an offset variable, but checks are unavoidable. Is that a preferred approach? What do you think about checks being potentially redirected to the goto location in a macro? Or we could refactor the code and remove the goto once and for all, and handle the error message in a macro.

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You can also just do one function that performs the check and in the caller run the goto in the failing branch while advancing the pointers in the succeeding branch. It is more verbose but also more explicit than the macro.

/* Always error on character mismatch conditioned on non-exhausted format, \
or when format is exhausted in the exact case. */ \
if ((format_len && *format != ch) || (exact && !format_len)){ \
goto parse_error; \
} \
/* Advance if format is not exhausted */ \
if (format_len) { \
++format; \
--format_len; \
} \

int parse_iso_8601_datetime(const char *str, int len, int want_exc,
npy_datetimestruct *out,
NPY_DATETIMEUNIT *out_bestunit,
int *out_local, int *out_tzoffset) {
int *out_local, int *out_tzoffset,
const char* format, int format_len, int exact) {
int year_leap = 0;
int i, numdigits;
const char *substr;
Expand Down Expand Up @@ -104,14 +118,19 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
while (sublen > 0 && isspace(*substr)) {
++substr;
--sublen;
FORMAT_STARTSWITH(' ');
}

/* Leading '-' sign for negative year */
if (*substr == '-') {
++substr;
--sublen;
FORMAT_STARTSWITH('-');
}

FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('Y');

if (sublen == 0) {
goto parse_error;
}
Expand Down Expand Up @@ -139,6 +158,9 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
if (out_local != NULL) {
*out_local = 0;
}
if (format_len) {
goto parse_error;
}
bestunit = NPY_FR_Y;
goto finish;
}
Expand All @@ -156,6 +178,7 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
ymd_sep = valid_ymd_sep[i];
++substr;
--sublen;
FORMAT_STARTSWITH(ymd_sep);
/* Cannot have trailing separator */
if (sublen == 0 || !isdigit(*substr)) {
goto parse_error;
Expand All @@ -167,6 +190,8 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
out->month = (*substr - '0');
++substr;
--sublen;
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('m');
/* Second digit optional if there was a separator */
if (isdigit(*substr)) {
out->month = 10 * out->month + (*substr - '0');
Expand All @@ -190,6 +215,9 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
if (!has_ymd_sep) {
goto parse_error;
}
if (format_len) {
goto parse_error;
}
if (out_local != NULL) {
*out_local = 0;
}
Expand All @@ -203,6 +231,7 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
}
++substr;
--sublen;
FORMAT_STARTSWITH(ymd_sep);
}

/* PARSE THE DAY */
Expand All @@ -213,6 +242,8 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
out->day = (*substr - '0');
++substr;
--sublen;
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('d');
/* Second digit optional if there was a separator */
if (isdigit(*substr)) {
out->day = 10 * out->day + (*substr - '0');
Expand All @@ -235,13 +266,17 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
if (out_local != NULL) {
*out_local = 0;
}
if (format_len) {
goto parse_error;
}
bestunit = NPY_FR_D;
goto finish;
}

if ((*substr != 'T' && *substr != ' ') || sublen == 1) {
goto parse_error;
}
FORMAT_STARTSWITH(*substr);
++substr;
--sublen;

Expand All @@ -250,6 +285,8 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
if (!isdigit(*substr)) {
goto parse_error;
}
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('H');
out->hour = (*substr - '0');
++substr;
--sublen;
Expand All @@ -274,6 +311,9 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
if (!hour_was_2_digits) {
goto parse_error;
}
if (format_len) {
goto parse_error;
}
bestunit = NPY_FR_h;
goto finish;
}
Expand All @@ -286,6 +326,7 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
if (sublen == 0 || !isdigit(*substr)) {
goto parse_error;
}
FORMAT_STARTSWITH(':');
} else if (!isdigit(*substr)) {
if (!hour_was_2_digits) {
goto parse_error;
Expand All @@ -298,6 +339,8 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
out->min = (*substr - '0');
++substr;
--sublen;
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('M');
/* Second digit optional if there was a separator */
if (isdigit(*substr)) {
out->min = 10 * out->min + (*substr - '0');
Expand All @@ -317,12 +360,16 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,

if (sublen == 0) {
bestunit = NPY_FR_m;
if (format_len) {
goto parse_error;
}
goto finish;
}

/* If we make it through this condition block, then the next
* character is a digit. */
if (has_hms_sep && *substr == ':') {
FORMAT_STARTSWITH(':');
++substr;
--sublen;
/* Cannot have a trailing ':' */
Expand All @@ -339,6 +386,8 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
out->sec = (*substr - '0');
++substr;
--sublen;
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('S');
/* Second digit optional if there was a separator */
if (isdigit(*substr)) {
out->sec = 10 * out->sec + (*substr - '0');
Expand All @@ -360,12 +409,15 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
if (sublen > 0 && *substr == '.') {
++substr;
--sublen;
FORMAT_STARTSWITH('.');
} else {
bestunit = NPY_FR_s;
goto parse_timezone;
}

/* PARSE THE MICROSECONDS (0 to 6 digits) */
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('f');
numdigits = 0;
for (i = 0; i < 6; ++i) {
out->us *= 10;
Expand Down Expand Up @@ -430,15 +482,22 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
while (sublen > 0 && isspace(*substr)) {
++substr;
--sublen;
FORMAT_STARTSWITH(' ');
}

if (sublen == 0) {
// Unlike NumPy, treating no time zone as naive
if (format_len > 0) {
goto parse_error;
}
goto finish;
}

/* UTC specifier */
if (*substr == 'Z') {
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('Z');

/* "Z" should be equivalent to tz offset "+00:00" */
if (out_local != NULL) {
*out_local = 1;
Expand All @@ -449,12 +508,17 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
}

if (sublen == 1) {
if (format_len > 0) {
goto parse_error;
}
goto finish;
} else {
++substr;
--sublen;
}
} else if (*substr == '-' || *substr == '+') {
FORMAT_STARTSWITH('%');
FORMAT_STARTSWITH('z');
/* Time zone offset */
int offset_neg = 0, offset_hour = 0, offset_minute = 0;

Expand Down Expand Up @@ -538,9 +602,10 @@ int parse_iso_8601_datetime(const char *str, int len, int want_exc,
while (sublen > 0 && isspace(*substr)) {
++substr;
--sublen;
FORMAT_STARTSWITH(' ');
}

if (sublen != 0) {
if ((sublen != 0) || (format_len != 0)) {
goto parse_error;
}

Expand Down
5 changes: 4 additions & 1 deletion pandas/_libs/tslibs/src/datetime/np_datetime_strings.h
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,10 @@ parse_iso_8601_datetime(const char *str, int len, int want_exc,
npy_datetimestruct *out,
NPY_DATETIMEUNIT *out_bestunit,
int *out_local,
int *out_tzoffset);
int *out_tzoffset,
const char* format,
int format_len,
int exact);

/*
* Provides a string length to use for converting datetime
Expand Down
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