String formatted output is a very important basic syntax of python, today the three kinds of formatted output to do a brief summary, I hope to help you.
Formatted Output: Content is output according to certain formatting requirements.
1. Use the placeholder % output
Prior to python version 2.6, formatting strings with % followed the C output format.
Instructions for use:
print("Formatting string" % variables)
# Variables more than 2 use tuple format:
print("Formatting string" % (variable1,variable2))
Use the % placeholder to indicate the position of a variable in a string.
The value passed in should correspond to the % placeholder variable.
where %s denotes a string, %d denotes an integer, %f denotes a decimal (the default retains six decimal places, and %.2f retains two decimal places), and %% is required to denote a percent sign when a formatting flag exists.
name='xiaoming'
age=12
print("My name is %s,My age is %d" %(name,age))
#exports：My name is xiaoming,My age is 12
formatting
format is a new method of formatting strings in python 2.6, which has the following advantages over %format:
- A single parameter can be output multiple times, and the order of the parameters can be different.
- Filling is very flexible and alignment is very powerful
- The official recommended way
Instructions for use:
print("...{indexing}, ... , {indexing}, ...".format((be) worth1, (be) worth2))
#Index {} is empty, default values are taken in order.
print("...{key1}, ... , {key2}, ...".format(key1=value,key2=value))
name='xiaoming'
age=12
print('My name is {}, My age is {}'.format(name,age))
print('My name is {0}, My age is {1}'.format(name,age))
print('My name is {name}, My age is {age}'.format(name='xiaoming',age=12))
#exports：My name is xiaoming,My age is 12
Format Advancement
1. Fill Alignment
# First get the value, then set the padding format after the colon: {index:[padding character][alignment][width]}
# *<20: left-justified, total of 20 characters, not enough to fill in the * sign
print('{0:*<20}'.format('hellopython'))
# *>20: right-aligned, total of 20 characters, not enough to fill in the * sign
print('{0:*>20}'.format('hellopython'))
# *^20: centered, total of 20 characters, with *'s for anything that's not enough.
print('{0:*^20}'.format('hellopython'))
exports：
hellopython*********
*********hellopython
****hellopython*****
2. Bit and Conversion
# Retain 2 valid digits
print("{:.2f}".format(3.1415926))
# Convert to binary
print('{0:b}'.format(16))
# Convert to octal
print('{0:o}'.format(10))
# Convert to hexadecimal
print('{0:x}'.format(15))
exports
3.14
10000
12
f
f-string formatting
The introduction of f-strings in Python 3.6 is not only easier than using them, but also more efficient.
Instructions for use
An f-string is a string preceded by "f", and {} is used directly with variables, expressions, and so on.
name='xiaoming'
age=12
Direct use of variables in #{}
print(f'My name is {name},My age is {age}')
Running expressions in #{}
print(f'{1+2+3}')
# Calling Python's built-in functions
print(f'{()}')
#Anonymous functions with lambda: can do complex numerical calculations
fun = lambda x : x+1
print(f'{fun(age)}')
# Output
My name is xiaoming,My age is 12
6
XIAOMING
13
summarize
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