Answer
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# 6.32 (Print calendar) Exercise 4.21 uses Zeller’s congruence to calculate the day of
# the week. Simplify Listing 6.13, PrintCalendar.py, using Zeller’s algorithm to get
# the start day of the month.
# Print the calendar for a month in a year
def printMonth(year, month):
# Print the headings of the calendar
printMonthTitle(year, month)
# Print the body of the calendar
printMonthBody(year, month)
# Print the month title, e.g., May, 1999
def printMonthTitle(year, month):
print(" ", getMonthName(month), year)
print("-----------------------------")
print(" Sun Mon Tue Wed Thu Fri Sat")
# Print month body
def printMonthBody(year, month):
# Get start day of the week for the first date in the month
startDay = getStartDay(year, month)
# Get number of days in the month
numberOfDaysInMonth = getNumberOfDaysInMonth(year, month)
# Pad space before the first day of the month
i = 0
for i in range(startDay):
print(" ", end="")
for i in range(1, numberOfDaysInMonth + 1):
print(format(i, "4d"), end="")
if (i + startDay) % 7 == 0:
print() # Jump to the new line
# Get the English name for the month
def getMonthName(month):
monthName = ""
if month == 1:
monthName = "January"
elif month == 2:
monthName = "February"
elif month == 3:
monthName = "March"
elif month == 4:
monthName = "April"
elif month == 5:
monthName = "May"
elif month == 6:
monthName = "June"
elif month == 7:
monthName = "July"
elif month == 8:
monthName = "August"
elif month == 9:
monthName = "September"
elif month == 10:
monthName = "October"
elif month == 11:
monthName = "November"
else:
monthName = "December"
return monthName
# Get the start day of month/1/year
def getStartDay(year, month):
if month == 1:
month = 13
year = year - 1 # January is counted as month 13 of the previous year.
elif month == 2:
month = 14
year = year - 1 # February is counted as month 14 of the previous year.
j = year // 100
k = year % 100
dayOfMonth = 1
dayOfWeek = (dayOfMonth + 26 * (month + 1) // 10 + k + k // 4 + j // 4 + 5 * j) % 7
return (dayOfWeek + 6) % 7
# Get the total number of days since January 1, 1800
def getTotalNumberOfDays(year, month):
total = 0
# Get the total days from 1800 to 1/1/year
for i in range(1800, year):
if isLeapYear(i):
total = total + 366
else:
total = total + 365
# Add days from Jan to the month prior to the calendar month
for i in range(1, month):
total = total + getNumberOfDaysInMonth(year, i)
return total
# Get the number of days in a month
def getNumberOfDaysInMonth(year, month):
if (month == 1 or month == 3 or month == 5 or month == 7 or
month == 8 or month == 10 or month == 12):
return 31
if month == 4 or month == 6 or month == 9 or month == 11:
return 30
if month == 2:
return 29 if isLeapYear(year) else 28
return 0 # If month is incorrect
# Determine if it is a leap year
def isLeapYear(year):
return year % 400 == 0 or (year % 4 == 0 and year % 100 != 0)
def main():
# Prompt the user to enter year and month
year = eval(input("Enter full year (e.g., 2001): "))
month = eval(input(("Enter month as number between 1 and 12: ")))
# Print calendar for the month of the year
printMonth(year, month)
main()
