What does the percent sign mean in python?

Recently, in the process of learning python, I discovered some situations of % (percent sign). Here is a brief introduction.

The percent sign in Python has two meanings. When calculating numbers, it means finding the remainder; the other one is the format string For example: "%d %s" %(12, 'abc') will replace %d with 12, replace %s with abc, and get '12 abc'. (Recommended learning: Python video tutorial)

The first type: numerical operation 1 % 3 refers to modular operation, taking the remainder (remainder)

>>> 7%2
1

th Two types: String operation 'abc %s' % 'abc' '%s' is similar to placeholder

is asking about the % operator (string formatting), the description is as follows:

%[(name)][flags][width].[precision]typecode

flags can have, -, ' ' or 0.

means right alignment. - means left alignment. ' ' is a space, which means padding a space to the left of the positive number to align it with the negative number. 0 means use 0 padding.

width represents the display width

precision represents the precision after the decimal point

Example

>>> print("%6.3f" % 2.3)
 2.300

# The first "% "The following content is the displayed format description, 6 is the display width, 3 is the number of decimal points, f is the floating point number type
# The second "%" is followed by the displayed content source, the output result is right-aligned, and the length is 2.300 It is 5, so there is a space in front

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