something wrong with the output of sample code

Question

mystring= 'Fred enters the swamp and picks up %s to eat later.'
food1= 'python'
food2 = 'swamp apples'
print(mystring % (food1, food2))
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    print(mystring % (food1, food2))
TypeError: not all arguments converted during string formatting

command 'print(mystring % (food1, food2))' I don't understand why it says TypeError? Isn't it supposed to print as 'Fred enters the swamp and picks up a python and a swamp apple to eat later' ??

Nir Alfasi · Accepted Answer · 2014-10-26 07:17:24Z

1

Because you have only one %s in the string and you're trying to assign two values in

print(mystring % (food1, food2))

change it to:

print(mystring % food1)

and it'll print just fine

edited Oct 26, 2014 at 7:17

answered Oct 26, 2014 at 6:34

Nir Alfasi

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3 Comments

Anny Over a year ago

thanks! but hmmmm... so I put print(mystring %s (food1, food2)) then it says the same :(

Nir Alfasi Over a year ago

@Anny I was referring to the %s in 'Fred enters the swamp and picks up %s to eat later.' See further update in the question

Anny Over a year ago

got it! so I put mystring= 'Fred enters the swamp and picks up a %s and a %s to eat later.' :]

Weafs.py · Accepted Answer · 2014-10-26 06:48:10Z

0

Use it this way:

mystring= 'Fred enters the swamp and picks up %s to eat later.'
food1= 'python'
food2 = 'swamp apples'
print(mystring % (food1 + ' and ' + food2))

Output:

Fred enters the swamp and picks up python and swamp apples to eat later.

Demo

edited Oct 26, 2014 at 6:48

answered Oct 26, 2014 at 6:41

Weafs.py

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4 Comments

Anny Over a year ago

yay! it works! now Fred gets to eat a python and a swamp apple! but I still don't understand why the command print(mystring % (food1, food2)) says type error? basically I put on the same thing as from the book but it didn't give the same output

Weafs.py Over a year ago

Its beacuse you are passing two strings while there is only one %s in mystring. What I've done is added both strings food1 and food2 together with an and between them, so now there is only one string.

Anny Over a year ago

got it! thanks a lot! i just found out i put the wrong variable:P it should be mystring= 'Fred enters the swamp and picks up a %s and a %s to eat later.'

Weafs.py Over a year ago

Yeah! I was gonna change your mystring, but was kinda afraid. :P

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