Python numbers, strings, list types and common operations

Python number type int float and common operation methods

"Division"print(10/4)print(type(10/4))"rounding"print(10 // 4)print(type(10 // 4))"The result is a floating point"print(10) // 4.0)import math"round left"a = math.floor(-3.4)print(a)print(type(a))"truncated"a = math.trunc(-3.4)print(a)print( type(a))"round, round (global function)"a = round(-3.4)print(a)print(type(a))

Python string types and common operation methods

@\ Escape character @\n line feed @\b backspace@\t tab path = r'C:\abc\xyz.txt' # r plays the original role and eliminates the escape print(path)print(type(path) )print(len(path)) # Character length a ='ok'print(path + a) # Character addition print(a * 5) # Character repetition and superposition s ='abcdefghijklmn'print(s[0:4]) # Characters 1st to 5-1=4 print(s[-1]) # Output the last print(s[len(s)-1]) # Output the last print(s[:]) # Output all print(s[0:4:2]) # output the first and third print(int('42') + 1) # output as 43inta = ord('c') # ASCII code print(a)print(chr (99)) # Common methods of ASCII code : h ='hello'h = h.replace('e','a') # Replace

url ='abc'print(url.upper()) # Change to uppercase"character string display format description"a = '3+2={0}'.format(5)a = '3+2={0 }'.format(20)print(a)print(type(a))a = 3.3333333a ='{0:.2f}'.format(a) # The result is 3.33d = ('name':'Tom' ,'age': 10,'job':'dev')a ='Name: {0}, age: {1}'.format(d.get('name'), d.get('age') )# The result is name: Tom, age: 10

xx ='{}=>{}'.format(a, b)print(xx) # The result is a=>bprint('{name}=>{salary}'.format(name='Tom', salary= 9000)) # The result is Tom=>9000url ='uke.cc' print(url.startswith('u')) # The result of string discrimination is bool type print(url.endswith('kk')) print(url .find('.')) # Find method, location Python list type and common operation method

a = [1, 2, 3]b = [4, 5, 6]print(a + b) # The result is [1 2 3 4 5 6]ls = list('youxiude')print(ls)print(' o'in ls) # Determine whether o is a letter in youxiude li = [c * 3 for c in'code'] # for loop print(li)a = [1, 2, 3]a[1:2] = [4, 5] # The result is [1 4 5 3]print(a)print(a * 3) # The result is [1 4 5 3 1 4 5 3 1 4 5 3]

Common methods of operation:

a.append(7) # Append an element print(a)a.extend([7, 8, 9]) # Append a list print(a)a.sort() # Ascending order print(a)a.reverse() # Descending order print(a)a.pop() # Pop up (delete) the last print(a)"delete"del (a[0])print(a)b = a.index(4) # Find the position by index print( b)b = a.count(7) # counter print(b)a = [1, 2, 3]print(a)b = a.copy() # copy the elements in the list to bprint(b)

s ='classroom.com' ls = list(s) print(ls) ls[-1] ='n' print(ls) s =''.join(ls) # The connection character function output is classroom.conprint(s ) s ='|'.join(ls) # The connection character output is c|l|a|s|s|r|o|o|m|.|c|o|nprint(s) url ='abc. com,uke.com,dfg.cn' print(url.split(',')) # The string is cut into lists at intervals of Boolean type:"Compare, return Boolean type!="score = 60.3print(score> = 60) # The result is True

print(3 + True) # bool type is essentially intprint(3 + False) dictionary table type:

d = {'name':'Tom','age': 10,'job':'dev'}ex = d['age']print(ex) # The result is 10ex = d.get('name', 'Not found')print(ex) # The result is Tomex = d.get('ff','Not found')print(ex) # The result is not found

Tuple type:

t = (1, 2, 3, 4) # t = [1, 2, 3, 4] is a list, the difference: the list supports in-situ modification

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Python numbers, strings, list types and common operations

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