I was writing a little code, that I left below:
"""
for(i=0;i<{0};i++){
eventObj
}
""".format('5')
it shows the next error:
KeyError: '\n eventObj\n '
but if I write:
"""
for(i=0;i<%s;i++){
eventObj
}
""" % ('5')
it doesn't show error and works without any kind of problem, I thought that both are equivalent
The question is: why happen that?
When you use the format() method, anything between { and } is treated as a parameter name or number that should be replaced with the corresponding argument.
Your string contains
{
eventObj
}
You get an error because there's no parameter that matches that name.
If you want to have literal { characters in a format string, you have to double them.
"""
for(i=0;i<{0};i++){{
eventObj
}}
""".format('5')
See How can I print literal curly-brace characters in python string and also use .format on it?
You don't get an error when you use % because it uses format operators beginning with %; { has no special meaning in the format string. In that case, you need to double the % character if it should be literal, but you don't have any literal % in your example.
