Python | Return lowercase characters from a given string

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Method # 1: Using a Loop
This is a brute force method in which this task can be accomplished. In this we iterate over the list and do string concatenation using the * operator and continue to construct the string that way.

# Python3 code to demonstrate how it works
# Construct a string from character frequency
# using a loop

# initialize the list

test_list = [( `g` , 4 ), ( `f` , 3 ), ( `g` , 2 )]

# print original list

print ( " The original list: " + str (test_list))

# Construct a string from character frequency # using a loop


  res   =   `` 
  for   char, freq   in   test_list:  

   res   =   res   +   char   *   freq 
  
  # print result  
  print   (  "The constructed string is:"   +   str   (res))

Output:

 The original list: [(`g`, 4), (`f`, 3), (` g`, 2)] The constructed string is: ggggfffgg

Method # 2: Using join () + list comprehension A combination of the above functions can be used to accomplish this task. In this we perform the extraction task using a list comprehension and creating a string using join ().







  # Python3 code to demonstrate how it works  
  # Construct a string from character frequency  
  # using join () + list comprehension  
  
  # initialize the list  
  test_list   =   [(  `g`  ,   4  ), ( ` f`  ,   3  ), (  ` g`  ,   2  )]  
  
  # print original list  
  print   (  "The original list:"   +   str   (test_list)) 
  
  # Construct string from character frequency  
  # using join () + list comprehension   
  res   =   `` .join (char   *   freq   for   char, freq   in   test_list) 
   
  # print result  

  print   (  "The constructed string is:"   +   str   (res))

Output:

 The original list: [(`g`, 4), (` f`, 3), (`g`, 2)] The constructed string is: ggggfffgg

Python | Return lowercase characters from a given string

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