add variable

Author: realDuYuanChao

basics/variable.py

@@ -0,0 +1,63 @@
+def main():
+    """
+    >>> a = 3
+    >>> b = 4
+    >>> a + b
+    7
+    >>> a - b
+    -1
+    >>> a * b
+    12
+    >>> a / b
+    0.75
+    >>> a // b
+    0
+    >>> a % b
+    3
+    >>> 3 ** 4
+    81
+
+    >>> type(3)
+    <class 'int'>
+    >>> type(3.14)
+    <class 'float'>
+    >>> type('a')
+    <class 'str'>
+    >>> type("abc")
+    <class 'str'>
+    >>> type(True)
+    <class 'bool'>
+    >>> type(None)
+    <class 'NoneType'>
+    >>> type(3 + 4j)
+    <class 'complex'>
+
+    >>> int(3.14)
+    3
+    >>> int(-3)
+    -3
+    >>> float("3.14")
+    3.14
+    >>> str(3.14)
+    '3.14'
+    >>> str(3 + 4j)
+    '(3+4j)'
+    >>> chr(65)
+    'A'
+    >>> chr(97)
+    'a'
+    >>> ord("a")
+    97
+    >>> ord("A")
+    65
+    >>> chr(ord('a') - 32)
+    'A'
+    >>> chr(ord('A') + 32)
+    'a'
+    """
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()