zellers congrunence

[bratiskovci]

1. How do I keep prompting the user for more dates until the user has indicated that he/she wishes to quit.
2. Computation of the day of the week MUST be moved to its own function.
3. How do I verify that the date entered is valid. For example, April only has 30 days so the user will not be allowed to enter April 31 as a valid date. See input section below to see how this is to be accomplished.
4. I have 2 functions which will help me ensure that the user enters a valid date. How do I integrate these functions into your solution.

# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
5:"Thursday", 6:"Friday"}

# Get user input: month, day, year
sys.stdout.write("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.readline().strip())

sys.stdout.write("Please enter the month (1-12): ")
month = int(sys.stdin.readline().strip())

sys.stdout.write("Please enter the year: ")
year = int(sys.stdin.readline().strip())

# Make adjustments for forumla
if month == 1 or month == 2:
month = month + 12
year = year - 1

# Compute coefficients
century = year/100
yearInCentury = year % 100

# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
(yearInCentury/4) + (century/4) - 2*century) % 7

# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

[bartonc]

Please post back using [ code ] [ /code ] (but without spaces) tags around your code. Otherwise, we can't see the structure of you code. Thanks.

for example

 
# this is code
 

[bratiskovci]

here is the code...

# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
5:"Thursday", 6:"Friday"}

# Get user input: month, day, year
sys.stdout.write("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.readline().strip())

sys.stdout.write("Please enter the month (1-12): ")
month = int(sys.stdin.readline().strip())

sys.stdout.write("Please enter the year: ")
year = int(sys.stdin.readline().strip())

# Make adjustments for forumla
if month == 1 or month == 2:
month = month + 12
year = year - 1

# Compute coefficients
century = year/100
yearInCentury = year % 100

# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
(yearInCentury/4) + (century/4) - 2*century) % 7

# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

[bartonc]

I'll work on the date thing. I want you to do the loop based on your other post, OK?

[bartonc]

Here's some date stuff for you to play with. Also look at the datetime module in the standard library.

import calendar
year = 2006
month = 10
day = 31
calendar.setfirstweekday(calendar.SUNDAY)
fd, nDays = calendar.monthrange(year, month)
if day > nDays:
    print "not a valid date"
 

Please use [code] tags when you post back. Thanks,
Barton

[bratiskovci]

 Input: the user inputs the amount in one of the following forms:
#         C value
#         F value
#         CM value
#         I value
#
# C - is a celcius value.  Program converts to fahrenheit
# F - is a fahrenheit value.  Program converts to celcius
# CM - is a centimetre value.  Program converts to inches
# I - is an inch value.  Program converts to centimetres
 
import sys
 
# Prompt user
sys.stdout.write( "Enter a value to convert: ")
 
# Read in a line from the keyboard
lineElements = sys.stdin.readline().split(" ")
 
# If the value is Celcius, convert to Fahrenheit
if lineElements[0].lower() == 'c':
    print "%s degress celcius is %.2f degrees fahrenheit." \
          % ( lineElements[1].strip(), (float(lineElements[1])*9.0/5.0)+32)
 
# If the value is Fahrenheit, convert to Celcius
elif lineElements[0].lower() == 'f':
    print "%s degress fahrenheit is %.2f degrees celcius." \
          % ( lineElements[1].strip(), (float(lineElements[1]) - 32) * 5.0/9.0)
 
# if the value is in centimetres, convert to inches
elif lineElements[0].lower() == 'cm':
    print "%s centimetres is %.2f inches." % ( lineElements[1].strip(),
                                             (float(lineElements[1]) * 0.3937))
 
# if the value is in inches, convert to centimetres
elif lineElements[0].lower() == 'i':
    print "%s inches is %.2f centimetres." % ( lineElements[1].strip(),
                                             (float(lineElements[1]) * 2.54))

[bratiskovci]

Sorry wrong code...this is the right code

import sys
 
# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
 5:"Thursday", 6:"Friday"}
 
# Get user input:  month, day, year
sys.stdout.write("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the month (1-12): ")
month = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the year: ")
year = int(sys.stdin.readline().strip())
 
# Make adjustments for forumla 
if month == 1 or month == 2:
    month = month + 12
    year = year - 1
 
# Compute coefficients
century = year/100
yearInCentury = year % 100
 
# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
             (yearInCentury/4) + (century/4) - 2*century) % 7
 
# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

[bartonc]

Sorry wrong code...this is the right code

import sys
 
# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
5:"Thursday", 6:"Friday"}
 
# Get user input: month, day, year
sys.stdout.write("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the month (1-12): ")
month = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the year: ")
year = int(sys.stdin.readline().strip())
 
# Make adjustments for forumla 
if month == 1 or month == 2:
month = month + 12
year = year - 1
 
# Compute coefficients
century = year/100
yearInCentury = year % 100
 
# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
(yearInCentury/4) + (century/4) - 2*century) % 7
 
# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

Awesome! You can post using tags! That's great.
Now you have some more things to work on after you copy the pieces from my last posts.
You CAN copy and paste to and from the forum, right?

[bratiskovci]

I am trying to incorporate this code into this program but I am have trouble getting to run properly. These functions are used for leap years...

def isLeap(year):
    if year % 400 == 0:
        return True
    elif year % 4 == 0 and year % 100 !=0:
        return True
    else:
        return False
 
def computeMaxDay(month, year):
    maxDays = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}
    if month == 2:
        if isLeap(year):
            return 29
    return maxDays[month]

[bartonc]

I am trying to incorporate this code into this program but I am have trouble getting to run properly. These functions are used for leap years...

def isLeap(year):
if year % 400 == 0:
return True
elif year % 4 == 0 and year % 100 !=0:
return True
else:
return False
 
def computeMaxDay(month, year):
maxDays = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}
if month == 2:
if isLeap(year):
return 29
return maxDays[month]

since

>>> 1996 %4
0
>>> 1997 %4
1
>>> 2000 %4
0
>>> not(2008 % 4)
True
>>>
You can simply

def IsLeapYear(year):
    return not (year % 4)
 

[bratiskovci]

I am to follow that exact code and not change it...this is what I have got but I am having trouble getting it to work.

import sys
 
# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
5:"Thursday", 6:"Friday"}
 
# Get user input: month, day, year
sys.stdout.write("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the month (1-12): ")
month = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the year: ")
year = int(sys.stdin.readline().strip())
# Determining Leap year.
def isLeap(year):
    if year % 400 == 0:
        return True
    elif year % 4 == 0 and year % 100 !=0:
        return True
    else:
        return False
# Determining Maximum number of days in each month possible.
def computeMaxDay(month, year):
    maxDays = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}
    if month == 2:
        if isLeap(year):
            return 29
    return maxDays[month]
 
# Make adjustments for forumla 
if month == 1 or month == 2:
month = month + 12
year = year - 1
 
# Compute coefficients
century = year/100
yearInCentury = year % 100
 
# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
(yearInCentury/4) + (century/4) - 2*century) % 7
 
 
 
# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]
 
# Output Quit Program  
while(input != "quit\n"):
 input = sys.stdin.readline()
 print "you typed : " + input

since

>>> 1996 %4
0
>>> 1997 %4
1
>>> 2000 %4
0
>>> not(2008 % 4)
True
>>>
You can simply

def IsLeapYear(year):
    return not (year % 4)
 

[bartonc]

This ought to help. Let us know how this ends up, please.

 
import sys
 
# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
5:"Thursday", 6:"Friday"}
# Determining Leap year.
def isLeap(year):
    if year % 400 == 0:
        return True
    elif year % 4 == 0 and year % 100 !=0:
        return True
    else:
        return False
# Determining Maximum number of days in each month possible.
def computeMaxDay(month, year):
    maxDays = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}
    if month == 2 and isLeap(year):
        return 29
    return maxDays[month]
def Zellers(day, month, year):
    # Make adjustments for forumla 
    if month == 1 or month == 2:
        month = month + 12
    year = year - 1
 
    # Compute coefficients
    century = year/100
    yearInCentury = year % 100
 
    # Compute the day using Zeller's congruence
    dayOfWeek = (day + ((month + 1)* 26)/10 + yearInCentury +
    (yearInCentury/4) + (century/4) - 2*century) % 7
    # Output answer
    return dayNames[dayOfWeek]
 
    # Your post says that you are not to change the code
    # But your code needs to change here so that you can prevent errors
    # Because "quit\n" can't be converted to an int.
    # but here is a "brute force" way to do it
print "Enter 'q' to quit" # anything other than a number works
while True:
    try:
        # Get user input: month, day, year
        sys.stdout.write("Please enter the day of the month (1-31): ")
        dayOfMonth = int(sys.stdin.readline().strip())
        sys.stdout.write("Please enter the month (1-12): ")
        month = int(sys.stdin.readline().strip())
        if month > 12:
            print "whatever"
            continue    # Bounce back to top of loop
 
        sys.stdout.write("Please enter the year: ")
        year = int(sys.stdin.readline().strip())
 
        if dayOfMonth > computeMaxDay(month, year):
            print "whatever"
            continue    # Bounce back to top of loop
        dayName = Zellers(dayOfMonth, month, year)
        print "Day of week is %s" % dayName
        print
    except ValueError:
        break
 

Keep posting,
Barton

[3dcampbell]

I know this thread is old but.. its was just what I needed. Thanks for being there. I incorporated your bits parts in my script along with a little extra flair. Here have a look. Thanks again.

#! /usr/bin/env python2.5
import os,sys
 
#print out months of the year
 
print "Please type in your birthdate by the year, month and day."
 
months = [
    'Janurary',
    'February',
    'March',
    'April',
    'May',
    'June',
    'July',
    'August',
    'September',
    'October',
    'November',
    'December' 
]
 
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday", 5:"Thursday", 6:"Friday"}
 
#Ending is just a seriies of additions of the endings. Instead of listing them all IE 'th', 'th'
# the mulitplicaitons does it for us and keeps it short for reading purposes
# IE.    'th, 'th, 'th"   is equal  to  3 * ['th']    in the code below  you could use the paranethsis
# or not as the mulitplication happen 1st in all code then the additions. 
 
endings = ['st', 'nd', 'rd'] + 17 * ['th'] \
        + ['st', 'nd', 'rd'] +  7 * ['th'] \
        + ['st']
 
year = int(raw_input('Year: '))
month = int(input('Month (1-12):'))
 
if month <= 12  and month >= 1:
    pass
else:
    sys.exit(`month` + " is not between 1-12")
 
dayOfMonth =int(input('Day (1-31): '))
 
#if day <= 31  and day >= 1:
#    print " "
#else:
#    sys.exit(`day` + " is not between 1-12")
 
 
month_number = int(month)
day_number   = int(dayOfMonth)
 
month_name = months[month_number-1]
ordinal = `dayOfMonth` + endings[day_number -1]
 
 
if month == 1 or month == 2:
    month  = month + 12
    year = year - 1
 
century = year/100
yearInCentury = year % 100
 
 
print dayOfMonth
dayOfWeek = (dayOfMonth + ((month +1) * 26) /10 + yearInCentury + (yearInCentury/4) + (century/4) - 2*century) % 7
 
 
print  month_name + " " + ordinal + "," + "%s is a %s" % (year, dayNames[dayOfWeek])