Added to maths and strings

maths/combinations.py

@@ -0,0 +1,18 @@
+from math import factorial
+
+
+def combinations(n,k):
+    """
+    >>> combinations(10,5)
+    252
+    >>> combinations(6,3)
+    20
+    >>> combinations(20,5)
+    15504
+    """
+    return int(factorial(n) / ((factorial(k)) * (factorial(n-k))))
+
+if __name__ == "__main__":
+    from doctest import testmod
+    testmod()
+

maths/gamma.py

@@ -0,0 +1,32 @@
+from math import factorial
+
+def gamma(num):
+    '''
+    >>> gamma(1)
+    1
+
+    >>> gamma(0)
+    Traceback (most recent call last):
+        ...
+    ValueError:  math domain error
+
+    >>> gamma(10)
+    362880
+
+    >>> gamma(-199)
+    Traceback (most recent call last):
+        ...
+    ValueError:  math domain error
+    '''
+
+
+    if num < 1:
+        raise ValueError(" math domain error")
+    else:
+        return factorial(num-1)
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+    testmod()
+

maths/radians.py

@@ -0,0 +1,24 @@
+from math import pi
+'''
+
+Coverts the given angle from degrees to radians
+https://en.wikipedia.org/wiki/Radian
+'''
+def radians(degree):
+
+    """
+    >>> radians(180)
+    3.141592653589793
+    >>> radians(92)
+    1.6057029118347832
+    >>> radians(274)
+    4.782202150464463
+    """
+
+    return degree / (180/pi)
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+    testmod()
+

strings/lower.py

@@ -0,0 +1,37 @@
+
+
+def lower(word):
+
+    ''' 
+    Will convert the entire string to lowecase letters 
+
+    >>> lower("wow")
+    'wow'
+    >>> lower("HellZo")
+    'hellzo'
+    >>> lower("WHAT")
+    'what'
+
+    >>> lower("wh[]32")
+    'wh[]32'
+    >>> lower("whAT")
+    'what'
+    '''
+    lower_string = ""
+
+    for char in word:
+        # converting to ascii value int value and checking to see if char is a capital letter
+        # if it is a capital letter it is getting shift by 32 which makes it a lower case letter
+        if ord(char) >= 65 and ord(char) <= 90:
+            lower_string += chr(ord(char) + 32)
+        else:
+            lower_string += char
+
+    return lower_string
+
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+    testmod()
+

strings/split.py

@@ -0,0 +1,32 @@
+
+def split(string,seperator = " "):
+    '''
+    Will split the string up into all the values seperated by the seperator (defaults to spaces)
+
+    >>> split("apple#banana#cherry#orange",seperator='#')
+    ['apple', 'banana', 'cherry', 'orange']
+
+    >>> split("Hello there")
+    ['Hello', 'there']
+
+    >>> split("11/22/63",seperator = '/')
+    ['11', '22', '63']
+
+    >>> split("12:43:39",seperator = ":")
+    ['12', '43', '39']
+    '''
+
+    split_words = []
+
+    last_index = 0  
+    for index,char in enumerate(string):
+        if char == seperator:
+            split_words.append(string[last_index:index])
+            last_index = index+1
+        elif index+1 == len(string):
+            split_words.append(string[last_index:index+1])            
+    return split_words
+
+if __name__ == "__main__":
+    from doctest import testmod
+    testmod()

strings/upper.py

@@ -0,0 +1,32 @@
+def upper(word):
+    ''' 
+    Will convert the entire string to uppercase letters 
+
+    >>> upper("wow")
+    'WOW'
+    >>> upper("Hello")
+    'HELLO'
+    >>> upper("WHAT")
+    'WHAT'
+
+    >>> upper("wh[]32")
+    'WH[]32'
+    '''
+    upper_string = ""
+
+    for char in word:
+        # converting to ascii value int value and checking to see if char is a lower letter
+        # if it is a capital letter it is getting shift by 32 which makes it a capital case letter
+        if ord(char) >= 97 and ord(char) <= 122:
+            upper_string += chr(ord(char) -32)
+        else:
+            upper_string += char
+
+    return upper_string
+
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+    testmod()
+