Documentation: Add docstring in each module

Author: Guyunjeong

projects/Calculate Age/src/calculate_age.py

@@ -3,6 +3,17 @@
 
 
 def age_calculator(name, age):
+    """
+        Calculate user's age in years, month, and days
+        based on current date and print.
+
+        Args:
+            name (str): user's name.
+            age (int): user's age in years.
+
+        Returns:
+            None.
+        """
     localtime = time.localtime(time.time())
 
     year = int(age)

projects/Calculate Age/src/main.py

@@ -2,6 +2,16 @@
 
 
 def main():
+    """
+        the user to input name and age, validate input,
+        and calculates and displays the user age in years, months and days.
+
+        Args:
+            None.
+
+        Return:
+            None.
+        """
     input_name = input("input your name: ")
 
     while True:

projects/Calculate Age/src/utilize_date.py

@@ -2,13 +2,30 @@
 
 
 def judge_leap_year(year):
+    """
+            judge the leap year.
+
+        Args:
+            year (int): To check the year.
+        return:
+             bool: Ture if the year is a leap year, False otherwise.
+        """
     if isleap(year):
         return True
     else:
         return False
 
 
 def month_days(month, leap_year):
+    """
+        Returns the number of days in each month
+
+        Args:
+             month (int): The month 1-12.
+
+        Returns:
+            int: The number of days in the month.
+        """
     if month in [1, 3, 5, 7, 8, 10, 12]:
         return 31
     elif month in [4, 6, 9, 11]: