问题
OK I was looking into number formatting and I found that you could use %d or %i to format an integer. For example:
number = 8
print "your number is %i." % number
or
number = 8
print "your number is %d." % number
But what is the difference? I mean i found something but it was total jibberish. Anyone speak Mild-Code or English here?
回答1:
Python copied the C formatting instructions.
For output, %i and %d are the exact same thing, both in Python and in C.
The difference lies in what these do when you use them to parse input, in C by using the scanf() function. See Difference between format specifiers %i and %d in printf.
Python doesn't have a scanf equivalent, but the Python string formatting operations retained the two options to remain compatible with C.
The new str.format() and format() format specification mini-language dropped support for i and stuck with d only.
回答2:
There isn't any, see the Python String Formatting Manual: http://docs.python.org/2/library/stdtypes.html#string-formatting
回答3:
No difference.
And here's the proof.
The reason why there are two is that, %i is just an alternative to %d ,if you want to look at it at a high level (from python point of view).
Here's what python.org has to say about %i: Signed integer decimal.
And %d: Signed integer decimal.
%d stands for decimal and %i for integer.
but both are same, you can use both.
来源：https://stackoverflow.com/questions/17680256/what-is-the-difference-between-i-and-d-in-python