What are the three output formats in python
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Three output formats of python
Environment: pycharm + python3.8
1.% (not recommended)
Format: format string% (output item 1, output item 2, … Output item n).
C characters s string d signed integers (10) o signed integers (8) x or X signed integers (16) f or F floating point numbers
Use:
Case one
Num1= 20num2 = 30print ('num1=%d, num=%d'% (num1, num2))
Output:
Num1=20, num=30
Case two
Num = 3.141526print ('% 0.2f'% num) # keep two decimal places print ('.1f'% num) # occupy 10 spaces, right-aligned print ('%-10.2f'% num) # occupy 10 spaces, align left
Output:
2. Format
Format: format (output item [, format string]), where the format string is selectable.
Case one
Num1= 20num2 = 30print ('num1= {}, num2= {}' .format (num1, num2))
Output:
Num1=20, num=30
Case two
Str1 = 'small bath' str2 = 'small cold' print ('{0} {1} {1} {0} '.format (str1, str2)) # mapping variable values from 0
Output:
A little bath, a cold bath.
Case three
Print ('{meng} {mu} '.format (mu=' Xiaomu', meng=' Xiaomeng'))
Output:
Xiaomeng Xiaomu
Case four
Right alignment ^ middle alignment = (for numbers only) to complete # 0displacement 3.14 after the decimal point | *: fill in extra blanks (easy to observe) | print ('--{0displacement 7} '.format)
Output:
Case five
Print ('decimal: {0 d}, hexadecimal: {0 x}, octal: {0 o}, binary: {0 b}' .format (31)) # with'# 'with the prefix print (' hexadecimal: {0orex}, octal: {0freuo}, binary: {0freb} '.format (31))
Output:
Decimal: 31, hexadecimal: 1f, octal: 37, binary: 11111
Hexadecimal: 0x1f, octal: 0o37, binary: 0b11111
Case 6
# convert to percentage and retain two decimal places print ('percentage: {: .2%}' .format (0.555555)) # retain two decimal places print ('retain two decimal places: {: .2}' .format (0.555555))
Output:
Percentage: 55.56%
Keep two decimal places: 0.56
Case 7
Print ('{:} *-* {:} '.format (1,-1)) # shows the symbol print (' {: +} *-* {: +} '.format (1,-1)) # if it is a positive number, leave the space print (' {:} *-* {:} '.format (1,-1)) # -, and' {:} {:} 'consistent print (' {: -} *-* {: -} '.format (1,-1))
Output
3. F-string
Usage: f'{}'
Case one
Name = "small bath" age = 20print (f'my name is {name}, I am {age} this year.')
Output:
My name is Xiao Mu. I'm 20 years old this year.
Case two
Name = "small bath" age = 20print (f'my name is {name},'f'is {age} this year.') # Multiline usage
Output:
My name is Xiao Mu. I'm 20 years old this year.
Case three
Num = 3.141526print (F' retains two decimal places: {num:.2f}')
Output:
Keep two decimal places: 3.14
For more usage, please refer to the second point above: format
Contrast
F-string: formatted string literals, formatting string constants.
The function is the same as%-formating, str.format (), easy to operate and fast.
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