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 interesting-facts-about-strings-in-python

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Like other programming languages, it’s possible to access individual characters of a string by using array-like indexing syntax. In this we can access each and every element of string through their index number and the indexing starts from 0. Python does index out of bound checking.

what is slicing

So, we can obtain the required character using syntax, string_name[index_position]:

  • The positive index_position denotes the element from the starting(0) and the negative index shows the index from the end(-1).

Example-

python - Sample - python code :

# A python program to illustrate slicing in strings
 
x = "Wiki at work"
 
# Prints 3rd character beginning from 0
print x[2]  
 
# Prints 7th character
print x[6]  
 
# Prints 3rd character from rear beginning from -1
print x[-3] 
 
# Length of string is 10 so it is out of bound
print x[15] 
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python tutorial - Output :

Traceback (most recent call last):
  File "8a33ebbf716678c881331d75e0b85fe6.py", line 15, in 
    print x[15] 
IndexError: string index out of range

python - Sample - python code :

e
a
o
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Slicing

To extract substring from the whole string then then we use the syntax like

slicing

python - Sample - python code :

string_name[beginning: end : step]
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slicing

  • beginning represents the starting index of string
  • end denotes the end index of string which is not inclusive 
  • steps denotes the distance between the two words.

Note: We can also slice the string using beginning and only and steps are optional.

Example-

python - Sample - python code :

# A python program to illustrate
# print substrings of a string
x = "Welcome to Wikitechy"
 
# Prints substring from 2nd to 5th character
print x[2:5]      
 
# Prints substring stepping up 2nd character 
# from 4th to 10th character
print x[4:10:2]    
 
# Prints 3rd character from rear from 3 to 5
print x[-5:-3]
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python tutorial - Output :

lco
oet
et

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