On Python string format output (format/printf)

The Python string is formatted using the "character% format 1% format 2 characters"% (variable 1, variable 2), and the% format represents the type of the accepted variable. Simple examples of use are as follows:

# Example: String formatting

Name = ' 17jo '
print ' www.%s.com '%name
>> www.17jo.com

Name = ' 17jo '
Zone = ' com '
print ' www.%s.%s '% (name,zone)
>> www.17jo.com

The string is formatted with a different format symbol after the percent sign, representing the different types to be converted, and the specific representation symbol is shown below.

Format symbol representation type

%s string
%d/%i decimal Integer
%u decimal integer
%o Eight-binary integers
%x/%x hexadecimal integer
%e/%e Scientific counting
%f/%f floating Point
% OUTPUT%

When the format symbol is a number, it can be preceded by an amount and a fill-in position such as:%[0][total number of digits [.] [Decimal place] to set the style to be converted, using the following method:

# example: Numeric formatting

nyear = 2018
Nmonth = 8
Nday = 18
# formatted date%02d number to two-bit integer vacancy fill 0
print '%04d-%02d-%02d '% (nyear,nmonth,nday)
>> 2018-08-18 # Output results

Fvalue = 8.123
print '%06.2f '%fvalue # reserved 2-bit decimal floating-point with a width of 6
>> 008.12 # Output

print '%d '%10 # output decimal
>> 10
print '%o '%10 # output octal
>> 12
print '%02x '%10 # output two-bit hex, letter lowercase blank complement 0
>> 0a
print '%04x '%10 # output four-bit hex, letter capital Vacancy 0
>> 000A
print '%.2e '%1.2888 # Output floating-point type with scientific notation reserved 2 decimal places
>> 1.29e+00

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