CLN: GH11271 move _get_handle, UTF encoders to io.common

Author: kawochen

pandas/core/common.py

@@ -5,8 +5,6 @@
 import re
 import collections
 import numbers
-import codecs
-import csv
 import types
 from datetime import datetime, timedelta
 from functools import partial
@@ -19,7 +17,7 @@
 import pandas.lib as lib
 import pandas.tslib as tslib
 from pandas import compat
-from pandas.compat import StringIO, BytesIO, range, long, u, zip, map, string_types, iteritems
+from pandas.compat import BytesIO, range, long, u, zip, map, string_types, iteritems
 from pandas.core.dtypes import CategoricalDtype, CategoricalDtypeType, DatetimeTZDtype, DatetimeTZDtypeType
 from pandas.core.config import get_option
 
@@ -2808,154 +2806,6 @@ def _all_none(*args):
     return True
 
 
-class UTF8Recoder:
-
-    """
-    Iterator that reads an encoded stream and reencodes the input to UTF-8
-    """
-
-    def __init__(self, f, encoding):
-        self.reader = codecs.getreader(encoding)(f)
-
-    def __iter__(self):
-        return self
-
-    def read(self, bytes=-1):
-        return self.reader.read(bytes).encode('utf-8')
-
-    def readline(self):
-        return self.reader.readline().encode('utf-8')
-
-    def next(self):
-        return next(self.reader).encode("utf-8")
-
-    # Python 3 iterator
-    __next__ = next
-
-
-def _get_handle(path, mode, encoding=None, compression=None):
-    """Gets file handle for given path and mode.
-    NOTE: Under Python 3.2, getting a compressed file handle means reading in
-    the entire file, decompressing it and decoding it to ``str`` all at once
-    and then wrapping it in a StringIO.
-    """
-    if compression is not None:
-        if encoding is not None and not compat.PY3:
-            msg = 'encoding + compression not yet supported in Python 2'
-            raise ValueError(msg)
-
-        if compression == 'gzip':
-            import gzip
-            f = gzip.GzipFile(path, mode)
-        elif compression == 'bz2':
-            import bz2
-            f = bz2.BZ2File(path, mode)
-        else:
-            raise ValueError('Unrecognized compression type: %s' %
-                             compression)
-        if compat.PY3:
-            from io import TextIOWrapper
-            f = TextIOWrapper(f, encoding=encoding)
-        return f
-    else:
-        if compat.PY3:
-            if encoding:
-                f = open(path, mode, encoding=encoding)
-            else:
-                f = open(path, mode, errors='replace')
-        else:
-            f = open(path, mode)
-
-    return f
-
-
-if compat.PY3:  # pragma: no cover
-    def UnicodeReader(f, dialect=csv.excel, encoding="utf-8", **kwds):
-        # ignore encoding
-        return csv.reader(f, dialect=dialect, **kwds)
-
-    def UnicodeWriter(f, dialect=csv.excel, encoding="utf-8", **kwds):
-        return csv.writer(f, dialect=dialect, **kwds)
-else:
-    class UnicodeReader:
-
-        """
-        A CSV reader which will iterate over lines in the CSV file "f",
-        which is encoded in the given encoding.
-
-        On Python 3, this is replaced (below) by csv.reader, which handles
-        unicode.
-        """
-
-        def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
-            f = UTF8Recoder(f, encoding)
-            self.reader = csv.reader(f, dialect=dialect, **kwds)
-
-        def next(self):
-            row = next(self.reader)
-            return [compat.text_type(s, "utf-8") for s in row]
-
-        # python 3 iterator
-        __next__ = next
-
-        def __iter__(self):  # pragma: no cover
-            return self
-
-    class UnicodeWriter:
-
-        """
-        A CSV writer which will write rows to CSV file "f",
-        which is encoded in the given encoding.
-        """
-
-        def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
-            # Redirect output to a queue
-            self.queue = StringIO()
-            self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
-            self.stream = f
-            self.encoder = codecs.getincrementalencoder(encoding)()
-            self.quoting = kwds.get("quoting", None)
-
-        def writerow(self, row):
-            def _check_as_is(x):
-                return (self.quoting == csv.QUOTE_NONNUMERIC and
-                        is_number(x)) or isinstance(x, str)
-
-            row = [x if _check_as_is(x)
-                   else pprint_thing(x).encode('utf-8') for x in row]
-
-            self.writer.writerow([s for s in row])
-            # Fetch UTF-8 output from the queue ...
-            data = self.queue.getvalue()
-            data = data.decode("utf-8")
-            # ... and reencode it into the target encoding
-            data = self.encoder.encode(data)
-            # write to the target stream
-            self.stream.write(data)
-            # empty queue
-            self.queue.truncate(0)
-
-        def writerows(self, rows):
-            def _check_as_is(x):
-                return (self.quoting == csv.QUOTE_NONNUMERIC and
-                        is_number(x)) or isinstance(x, str)
-
-            for i, row in enumerate(rows):
-                rows[i] = [x if _check_as_is(x)
-                           else pprint_thing(x).encode('utf-8') for x in row]
-
-            self.writer.writerows([[s for s in row] for row in rows])
-            # Fetch UTF-8 output from the queue ...
-            data = self.queue.getvalue()
-            data = data.decode("utf-8")
-            # ... and reencode it into the target encoding
-            data = self.encoder.encode(data)
-            # write to the target stream
-            self.stream.write(data)
-            # empty queue
-            self.queue.truncate(0)
-
-
 def get_dtype_kinds(l):
     """
     Parameters

pandas/core/format.py

@@ -13,6 +13,7 @@
                           OrderedDict)
 from pandas.util.terminal import get_terminal_size
 from pandas.core.config import get_option, set_option
+from pandas.io.common import _get_handle, UnicodeWriter
 import pandas.core.common as com
 import pandas.lib as lib
 from pandas.tslib import iNaT, Timestamp, Timedelta, format_array_from_datetime
@@ -1475,7 +1476,7 @@ def save(self):
             f = self.path_or_buf
             close = False
         else:
-            f = com._get_handle(self.path_or_buf, self.mode,
+            f = _get_handle(self.path_or_buf, self.mode,
                                 encoding=self.encoding,
                                 compression=self.compression)
             close = True
@@ -1488,7 +1489,7 @@ def save(self):
                                  quotechar=self.quotechar)
             if self.encoding is not None:
                 writer_kwargs['encoding'] = self.encoding
-                self.writer = com.UnicodeWriter(f, **writer_kwargs)
+                self.writer = UnicodeWriter(f, **writer_kwargs)
             else:
                 self.writer = csv.writer(f, **writer_kwargs)
 

pandas/io/common.py

@@ -2,11 +2,14 @@
 
 import sys
 import os
+import csv
+import codecs
 import zipfile
 from contextlib import contextmanager, closing
 
 from pandas.compat import StringIO, string_types, BytesIO
 from pandas import compat
+from pandas.core.common import pprint_thing, is_number
 
 
 if compat.PY3:
@@ -284,3 +287,148 @@ def ZipFile(*args, **kwargs):
             yield zf
 else:
     ZipFile = zipfile.ZipFile
+
+
+def _get_handle(path, mode, encoding=None, compression=None):
+    """Gets file handle for given path and mode.
+    """
+    if compression is not None:
+        if encoding is not None and not compat.PY3:
+            msg = 'encoding + compression not yet supported in Python 2'
+            raise ValueError(msg)
+
+        if compression == 'gzip':
+            import gzip
+            f = gzip.GzipFile(path, mode)
+        elif compression == 'bz2':
+            import bz2
+            f = bz2.BZ2File(path, mode)
+        else:
+            raise ValueError('Unrecognized compression type: %s' %
+                             compression)
+        if compat.PY3:
+            from io import TextIOWrapper
+            f = TextIOWrapper(f, encoding=encoding)
+        return f
+    else:
+        if compat.PY3:
+            if encoding:
+                f = open(path, mode, encoding=encoding)
+            else:
+                f = open(path, mode, errors='replace')
+        else:
+            f = open(path, mode)
+
+    return f
+
+
+class UTF8Recoder:
+
+    """
+    Iterator that reads an encoded stream and reencodes the input to UTF-8
+    """
+
+    def __init__(self, f, encoding):
+        self.reader = codecs.getreader(encoding)(f)
+
+    def __iter__(self):
+        return self
+
+    def read(self, bytes=-1):
+        return self.reader.read(bytes).encode("utf-8")
+
+    def readline(self):
+        return self.reader.readline().encode("utf-8")
+
+    def next(self):
+        return next(self.reader).encode("utf-8")
+
+    # Python 3 iterator
+    __next__ = next
+
+
+if compat.PY3:  # pragma: no cover
+    def UnicodeReader(f, dialect=csv.excel, encoding="utf-8", **kwds):
+        # ignore encoding
+        return csv.reader(f, dialect=dialect, **kwds)
+
+    def UnicodeWriter(f, dialect=csv.excel, encoding="utf-8", **kwds):
+        return csv.writer(f, dialect=dialect, **kwds)
+else:
+    class UnicodeReader:
+
+        """
+        A CSV reader which will iterate over lines in the CSV file "f",
+        which is encoded in the given encoding.
+
+        On Python 3, this is replaced (below) by csv.reader, which handles
+        unicode.
+        """
+
+        def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
+            f = UTF8Recoder(f, encoding)
+            self.reader = csv.reader(f, dialect=dialect, **kwds)
+
+        def next(self):
+            row = next(self.reader)
+            return [compat.text_type(s, "utf-8") for s in row]
+
+        # python 3 iterator
+        __next__ = next
+
+        def __iter__(self):  # pragma: no cover
+            return self
+
+    class UnicodeWriter:
+
+        """
+        A CSV writer which will write rows to CSV file "f",
+        which is encoded in the given encoding.
+        """
+
+        def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
+            # Redirect output to a queue
+            self.queue = StringIO()
+            self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
+            self.stream = f
+            self.encoder = codecs.getincrementalencoder(encoding)()
+            self.quoting = kwds.get("quoting", None)
+
+        def writerow(self, row):
+            def _check_as_is(x):
+                return (self.quoting == csv.QUOTE_NONNUMERIC and
+                        is_number(x)) or isinstance(x, str)
+
+            row = [x if _check_as_is(x)
+                   else pprint_thing(x).encode("utf-8") for x in row]
+
+            self.writer.writerow([s for s in row])
+            # Fetch UTF-8 output from the queue ...
+            data = self.queue.getvalue()
+            data = data.decode("utf-8")
+            # ... and reencode it into the target encoding
+            data = self.encoder.encode(data)
+            # write to the target stream
+            self.stream.write(data)
+            # empty queue
+            self.queue.truncate(0)
+
+        def writerows(self, rows):
+            def _check_as_is(x):
+                return (self.quoting == csv.QUOTE_NONNUMERIC and
+                        is_number(x)) or isinstance(x, str)
+
+            for i, row in enumerate(rows):
+                rows[i] = [x if _check_as_is(x)
+                           else pprint_thing(x).encode("utf-8") for x in row]
+
+            self.writer.writerows([[s for s in row] for row in rows])
+            # Fetch UTF-8 output from the queue ...
+            data = self.queue.getvalue()
+            data = data.decode("utf-8")
+            # ... and reencode it into the target encoding
+            data = self.encoder.encode(data)
+            # write to the target stream
+            self.stream.write(data)
+            # empty queue
+            self.queue.truncate(0)