Python string interception operation

User 7886150 2021-01-22 14:54:27
python string interception operation


Reference link : Python character string

Let me write it first : 

Given a string str,str[begin:end:step], These three orders never change  

step > 0 

begin stay end To the right of  

step < 0 

begin stay end Left side  

for instance : 

mystring = '12345abcde' 

12345abcde0123456789-10-9-8-7-6-5-4-3-2-1

The first line in the table is the string to be processed , The second line is the subscript of the positive order , The third line is the subscript in reverse order  

Here are some common string interception operations : 

mystring = '12345abcde'

print(' Cut off the 1 Position to the first 5 A character :', mystring[0:5])                 # Cut off the 1 Position to the first 5 A character

print(' Intercepts all characters of a string ', mystring[:])                      # Intercepts all characters of a string

print(' Cut off the 5 Two characters to the end :', mystring[5:])                     # Cut off the 6 Two characters to the end

print(' Intercept from the beginning to the penultimate 3 Two characters before :', mystring[:-3])        # Intercept from the beginning to the penultimate 3 Two characters before

print(' Cut off the 5 Characters ;', mystring[4])                            # Cut off the 5 Characters

print(' Intercept the penultimate 3 Characters :', mystring[-3])                       # Intercept the penultimate 3 Characters

print(' Intercept the penultimate 3 Bit and penultimate 1 Character before bit ;', mystring[-3:-1])   # Intercept the penultimate 3 Bit and penultimate 1 Character before bit

print(' Intercept the last three to the end :', mystring[-3:])                   # Intercept the last three to the end

print(' Reverse order interception from the penultimate 1 One to the bottom 5 individual , In steps of -1, Default begin by -1:', mystring[:-5:-1])   # Reverse order interception from the penultimate 1 One to the bottom 5 individual , In steps of -1, Default begin by -1

print(' Reverse order interception from the penultimate 1 One to the bottom 5 individual , In steps of 1, Default begin by 0:', mystring[:-5:1])     # Reverse order interception from the penultimate 5 One to the bottom 2 individual , In steps of 1, Default begin by 0

print(' Intercept all characters in reverse order :', mystring[::-1])                      # Output all characters in reverse order

print(' Intercept the penultimate in reverse order 3 One to the bottom 10 individual , In steps of 3:', mystring[-3:-10:-3])  # Intercept the penultimate in reverse order 3 One to the bottom 10 individual , In steps of 3 

Output results : 

Cut off the 1 Position to the first 5 A character : 12345

Intercepts all characters of a string 12345abcde

Cut off the 5 Two characters to the end : abcde

Intercept from the beginning to the penultimate 3 Two characters before : 12345ab

Cut off the 5 Characters ; 5

Intercept the penultimate 3 Characters : c

Intercept the penultimate 3 Bit and penultimate 1 Character before bit ; cd

Intercept the last three to the end : cde

Reverse order interception from the penultimate 1 One to the bottom 5 individual , In steps of -1, Default begin by -1: edcb

Reverse order interception from the penultimate 1 One to the bottom 5 individual , In steps of 1, Default begin by 0: 12345

Intercept all characters in reverse order : edcba54321

Intercept the penultimate in reverse order 3 One to the bottom 10 individual , In steps of 3: c52

Process finished with exit code 0

Link to the original text : https://blog.csdn.net/ssjdoudou/article/details/83927099?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522161129604616780271578618%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=161129604616780271578618&biz_id=0&utm_medium=distribute.pc_search_result.none-

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