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Problem_019.py

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+######################################################################
+# Starts at the startYear, startMonth, startWeekday (assuming you are starting at the 1st of the month).
+# Counts through each month between the time period keeping track of which day of the week the start of
+# each month is falling on. Adds to counter if the weekday is a Sunday on the 1st of the month and outputs.
+######################################################################
+
+# days in each month for normal and leap years
+monthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+monthDaysLeap = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+
+# start date information
+startYear = 1901
+startMonth = 1
+startWeekday = 2
+
+# end date information
+endYear = 2000
+endMonth = 12
+
+# other variables
+year = startYear
+month = startMonth
+weekday = startWeekday
+
+counter = 0
+
+# main
+while year < endYear:
+    if weekday == 1:
+        counter += 1
+
+    if year%4 == 0:
+        weekday = (monthDaysLeap[month-1] + weekday)%7
+    else:
+        weekday = (monthDays[month-1] + weekday)%7
+    
+    if month == 12:
+        month = 1
+        year += 1
+    else:
+        month += 1
+
+print(counter)
+# Solution: 171
+    
+        
+
+
+