Basic python programming

Question

I don't know what is wrong. I tells me I have a string formatting error where a = y % 19 and then it also tells me I have something wrong with the module when I am calling the main(). No clue on how to fix this because it seems I am calling the main() function correctly and the string seems fine.

def main():
 y = input("Enter year: ")
 print ("y = ", y)
 a = y % 19
 print ("a = ", a)
 b = y / 100
 print ("b = ", b)
 c = y % 100
 print ("c = ", c)
 d = b / 4
 print ("d = ", d)
 e = b % 4
 print ("e = ", e)
 g = (8 * b + 13) / 25
 print ("g = ", g)
 h = (19 * a + b - d - g + 15) / 30
 print ("h = ", h)
 j = c / 4
 print ("j = ", j)
 k = c % 4
 print ("k = ", k)
 m = (a + 11 * h) / 319
 print ("m = ", m)
 r = (2 * e + 2 * j - k - h + m + 32) % 7
 print ("r = ", r)
 n = (h - m + r + 90) / 25
 print ("n = ", n)
 p = (h - m + r + n + 19) % 32
 print ("p = ", p)
 print ("In ", y, "Easter Sunday is on", p,)
 if (n == 3):
 print ("March")
 if (n == 4):
 print ("April")
main()

• Ashwini Chaudhary: Python version? and also post the full traceback.

Answer 1

It seems like you're using Python 3. If so, the first problem is that y is a string (like "2013"), not a number (like 2013). The % operation means something different for strings than it does for numbers; you'll have to convert y to an integer by saying y = int(input('....')).

Not sure what the problem with the module is; can you post the exact error message and the way that you're running the code? (Is it in IDLE, by calling python myscript.py, or what?)

• Suliman Sharif: It says traceback(most recent call last): File "EasterSunday.py". line 69 in <module> main and then File "EasterSunday.py", line 24, in main a = y % 19. TypeError: not all arguments converted during string formatting
• Danica: Ah, that's only the one error! It's just showing you where the problem was located.
• Suliman Sharif: Okay so I tried changing the int in the year to enter but unfortunately now everything comes out as a decimal which I didn't want I tried putting int(input for the formulas but that didn't work. So it just won't now print the rest of my code correctly.
• Danica: Use b = y // 100 to have it round the result down rather than put it as a decimal. Alternatively, you could use b = int(y / 100) if you wanted.

Answer 2

input() returns a string. You may like to convert it to an int as x = int(input(...))

You may like to use raw_input() also if you're using Python v2.x, which also returns string but does not evaluate any expression.

Check here for more details.

Answer 3

~$ python3 Test.py
Enter year: 2013
y = 2013
Traceback (most recent call last):
 File "Test.py", line 51, in <module>
 main()
 File "Test.py", line 6, in main
 a = y % 19
TypeError: not all arguments converted during string formatting
~$ python2.7 Test.py
Enter year: 2013
('y = ', 2013)
('a = ', 18)
('b = ', 20)
('c = ', 13)
('d = ', 5)
('e = ', 0)
('g = ', 6)
('h = ', 12)
('j = ', 3)
('k = ', 1)
('m = ', 0)
('r = ', 4)
('n = ', 4)
('p = ', 7)
('In ', 2013, 'Easter Sunday is on', 7)
April