Python - Convert delimiter seperated Mixed String to valid List

Given a string with elements and delimiters, split elements on delimiter to extract with elements ( including containers).

Input : test_str = “6*2*9*[3, 5, 6]*(7, 8)*8*4*10”, delim = “*”
Output : [6, 2, 9, [3, 5, 6], (7, 8), 8, 4, 10]
Explanation : Containers and elements separated using *.

Input : test_str = “[3, 5, 6]*(7, 8)*8*4*10”, delim = “*”
Output : [[3, 5, 6], (7, 8), 8, 4, 10]
Explanation : Containers and elements separated using *.

Method #1 : Using loop + eval() + split()

This is one way in which this task can be done. In this the separation is done using split() and eval() does the important task of performing evaluation of data types to be containers or simpler elements.

Python3

# Python3 code to demonstrate working of  
# Convert delimiter seperated Mixed String to valid List 
# Using loop + split() + eval() 
  
# initializing string 
test_str = "6# 2# 9#[3, 5, 6]#(7, 8)# 8# 4# 10"
  
# printing original string 
print("The original string is : " + str(test_str)) 
  
# initializing delim  
delim = "#"
  
# spliting using split() 
temp = test_str.split(delim)  
res = [] 
  
# using loop + eval() to convert to  
# required result 
for ele in temp: 
  res.append(eval(ele)) 
  
# printing result  
print("List after conversion : " + str(res))  

Output

The original string is : 6#2#9#[3, 5, 6]#(7, 8)#8#4#10
List after conversion : [6, 2, 9, [3, 5, 6], (7, 8), 8, 4, 10]

Method #2 : Using eval() + split() + list comprehension

This is yet another way in which this task can be performed. In this, we perform similar task as above method. The only difference being that entire logic is encapsulated as one liner using list comprehension.

Python3

# Python3 code to demonstrate working of  
# Convert delimiter seperated Mixed String to valid List 
# Using eval() + split() + list comprehension 
  
# initializing string 
test_str = "6# 2# 9#[3, 5, 6]#(7, 8)# 8# 4# 10"
  
# printing original string 
print("The original string is : " + str(test_str)) 
  
# initializing delim  
delim = "#"
  
# encapsulating entire result in list comprehension  
res = [eval(ele) for ele in test_str.split(delim)] 
  
# printing result  
print("List after conversion : " + str(res))  

Output

The original string is : 6#2#9#[3, 5, 6]#(7, 8)#8#4#10
List after conversion : [6, 2, 9, [3, 5, 6], (7, 8), 8, 4, 10]

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Python – Convert delimiter seperated Mixed String to valid List

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