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Python – Convert key-value String to dictionary

  • Last Updated : 10 May, 2020
Geek Week

Sometimes, while working with Python strings, we can have problem in which we need to convert a string key-value pairs to dictionary. This can have applications in which we are working with string data and needs to be converted. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using map() + split() + loop
The combination of above functionalities can be used to perform this task. In this, we perform the conversion of key-value pair to dictionary using map and splitting key-value pairs is done using split().




# Python3 code to demonstrate working of 
# Convert key-value String to dictionary
# Using map() + split() + loop
  
# initializing string
test_str = 'gfg:1, is:2, best:3'
  
# printing original string
print("The original string is : " + str(test_str))
  
# Convert key-value String to dictionary
# Using map() + split() + loop
res = []
for sub in test_str.split(', '):
    if ':' in sub:
        res.append(map(str.strip, sub.split(':', 1)))
res = dict(res)
  
# printing result 
print("The converted dictionary is : " + str(res)) 
Output :
The original string is : gfg:1, is:2, best:3
The converted dictionary is : {'gfg': '1', 'is': '2', 'best': '3'}

 

Method #2 : Using dict() + generator expression + split() + map()
This is yet another way in which this problem can be solved. In this, we perform the task in similar way as above but in 1 liner way using dict() and generator expression.






# Python3 code to demonstrate working of 
# Convert key-value String to dictionary
# Using dict() + generator expression + split() + map()
  
# initializing string
test_str = 'gfg:1, is:2, best:3'
  
# printing original string
print("The original string is : " + str(test_str))
  
# Convert key-value String to dictionary
# Using dict() + generator expression + split() + map()
res = dict(map(str.strip, sub.split(':', 1)) for sub in test_str.split(', ') if ':' in sub)
  
# printing result 
print("The converted dictionary is : " + str(res)) 
Output :
The original string is : gfg:1, is:2, best:3
The converted dictionary is : {'gfg': '1', 'is': '2', 'best': '3'}

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