rename and add doctest (TheAlgorithms#1501)

Author: realDuYuanChao

maths/find_max.py

@@ -10,11 +10,11 @@ def find_max(nums):
     True
     True
     """
-    max = nums[0]
+    max_num = nums[0]
     for x in nums:
-        if x > max:
-            max = x
-    return max
+        if x > max_num:
+            max_num = x
+    return max_num
 
 
 def main():

maths/find_min.py

@@ -1,17 +1,25 @@
-"""Find Minimum Number in a List."""
+def find_min(nums):
+    """
+    Find Minimum Number in a List
+    :param nums: contains elements
+    :return: max number in list
 
+    >>> for nums in ([3, 2, 1], [-3, -2, -1], [3, -3, 0], [3.0, 3.1, 2.9]):
+    ...     find_min(nums) == min(nums)
+    True
+    True
+    True
+    True
+    """
+    min_num = nums[0]
+    for num in nums:
+        if min_num > num:
+            min_num = num
+    return min_num
 
-def main():
-    """Find Minimum Number in a List."""
-
-    def find_min(x):
-        min_num = x[0]
-        for i in x:
-            if min_num > i:
-                min_num = i
-        return min_num
 
-    print(find_min([0, 1, 2, 3, 4, 5, -3, 24, -56]))  # = -56
+def main():
+    assert find_min([0, 1, 2, 3, 4, 5, -3, 24, -56]) == -56
 
 
 if __name__ == "__main__":