Generate Random Strings and Passwords in Python

string.ascii_lowercase retunr all the lowercase letter in a single string. I.e., 'abcdefghijklmnopqrstuvwxyz'

random.choice() function choose a single character from a list.

Example 1:

import random
import string

def generateString(stringSize=8):
    """Generate a random string of fixed length """
    letters = string.ascii_lowercase
    return ''.join(random.choice(letters) for i in range(stringSize))


# default length 8
print ("Random String is ", generateString() )
print ("Random String is ", generateString(10) )
print ("Random String is ", generateString(10) )

Example 2: Using user defined string

import random

def generateString(stringSize=8):
        """Generate a random string of fixed length """
       letters = 'abcdefghijklmnopqrstuvwxyz'
      return ''.join(random.choice(letters) for i in range(stringSize))  

 # default length 8 
print ("Random String is ", generateString() ) 
print ("Random String is ", generateString(10) ) 
print ("Random String is ", generateString(10) )

Example 3: Generate random id of length 8

like 'ABCD1234'

import random
def generateString(): 
    """Generate a random string of fixed length """
    
    letters = 'abcdefghijklmnopqrstuvwxyz' 
    numbers = '0123456789'
    
    prefix =  ''.join(random.choice(letters) for i in range(4)) 
    suffix =  ''.join(random.choice(numbers) for i in range(4 )) 
    
    return    prefix + sufix

# default length 8 
print ("Random String is ", generateString() )

Other useful methods:

string.ascii_uppercase: return upper case letter
string.ascii_lowercase: return upper case letter
string.ascii_letters: return mix of upper case letter and lower case
string.digits: return digits letter
string.printable: contains all lower case and upper case letters, digits, and special characters.
string.punctuation: return punctuations

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