Basic data type
number int , all functions, put in int
a1 = 123
a1 = 456
- int
converts string to number
a = "123"
print(type(a),a)
b = int(a)
print (type(b),b)
num = "0011"
v = int(num, base=16)
print(v)
- bit_lenght
# The binary of the current number, represented by at least n bits
r = age.bit_length()
string str
s1 = "asdf"
s2 = "asdffas"
# test = "aLex"
# capitalize
# v = test.capitalize()
# print(v)
# All lowercase, casefold is more powerful, many unknown pairs are correspondingly lowercase
# v1 = test.casefold()
# print(v1)
# v2 = test.lower( )
# print(v2)
# Set the width and center the content
# 20 refers to the total length
# * Blank unknown padding, one character, optional
# v = test.center(20,"中")
# print(v )
# Go to the string to find the number of occurrences of the subsequence
# test = "aLexalexr"
# v = test.count('ex')
# print(v)
# test = "aLexalexr"
# v = test.count(' ex',5,6)
# print(v)
# owe
# encode
# decode
# ends
with what # starts with what
# test = "alex"
# v = test.endswith('ex')
# v = test.startswith('ex')
# print(v)
# owes
# test = "12345678\t9"
# v = test.expandtabs(6)
# print(v,len(v))
# Search backward from the beginning, after finding the first one, get its unknown
# > or >=
# test = "alexalex"
# not found -1
# v = test.find('ex')
# print(v)
# index not found, error is ignored
# test = "alexalex"
# v = test.index('8')
# print(v)
# Format, replace placeholders in a string with the specified value
# test = 'i am {name}, age {a}'
# print(test)
# v = test.format( name='alex',a=19)
# print(v)
# test = 'i am {0}, age {1}'
# print(test)
# v = test.format('alex',19)
# print (v)
# Format, passed in values {"name": 'alex', "a": 19}
# test = 'i am {name}, age {a}'
# v1 = test.format(name= 'df',a=10)
# v2 = test.format_map({"name": 'alex', "a": 19})
# Whether the string contains only letters and numbers
# test = "123"
# v = test.isalnum()
# print(v)
list list
...
tuple
...
dictionary dict
...
boolean bool
...
Python basic data types and strings
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