Python | Convert string to list of tuples

Method # 1: Using loop + split () + replace ()
This is a brute force method to accomplish this task. In this we perform the task of extracting and re-converting tuples to a list in a loop using the split () and replace () functions.






  # Python3 code to demonstrate how it works  
  # Convert string to list of tuples  
  # using loop + replace () + split ()  
  
  # initialization string  
  test_str   =   "(1, 3, 4), (5, 6, 4), (1, 3, 6) " 
   
  # print the original line  
  print   (  "The original string is:"   +   test_str) 
   
  # Convert string to list of tuples  
  # using loop + replace () + split ()  

  res   =   [] 
  temp   =   [] 
  for   token   in   test_str.split (  ","  ): 
   num   =   int   (token.replace (  "("  , " "). replace (" )   ","   ")) 
   temp.append (num) 
   if   ")"   in   token: 
   res.append (  tuple   (temp)) 
   temp   =   [] 
  
  # print result  
  print   (  "List after conversion from string:"   +   str   (res))

Output:

 The original string is: (1, 3, 4), (5, 6, 4), (1, 3, 6) List after conversion from string: [(1, 3, 4), (5, 6, 4), (1, 3, 6) ]

Method # 2: Using eval()
This built-in function can also be used to accomplish this task. This function internally evaluates the string and returns a transformed list of tuples as desired.

# Python3 code to demonstrate how it works
# Convert string to list of tuples
# using eval ()

# initialization string

test_str = "(1, 3, 4), (5, 6, 4), (1, 3, 6)"

# print the original line

print ( "The original string is:" + test_str)

# Convert string to list of tuples # using eval ()


  res   =   list   (  eval   (test_str)) 
  
  # print result  
  print   (   "List after conversion from string:"   +   str   (res))

Output:

The original string is: (1, 3, 4), (5, 6, 4), (1, 3, 6) List after conversion from string: [(1, 3, 4 ), (5, 6, 4), (1, 3, 6)]

Python | Convert string to list of tuples

Submit new EBook