Sometimes, we are fed with string and we may have to convert it’s content to dictionary. The string may have a specified format that could be key-value convertible. This type of problem is quite common in Machine Learning domain. Let’s discuss certain ways in which this problem can be solved.
Method #1 : Using split() + dictionary comprehension The combination of above method can be used to perform this particular task. This is 2 process method. In 1st step, the string is converted to list using split and then converted back to dictionary using dictionary comprehension.
Python3
# Python3 code to demonstrate working of# Converting String content to dictionary# Using dictionary comprehension + split()# initializing stringtest_str = "Gfg = 1, Good = 2, CS = 3, Portal = 4 "# printing original stringprint("The original string is : " + test_str)# Using dictionary comprehension + split()# Converting String content to dictionaryres = {key: int(val) for key, val in (item.split('=') for item in test_str.split(', '))}# printing resultprint("The newly created dictionary : " + str(res)) |
The original string is : Gfg = 1, Good = 2, CS = 3, Portal = 4
The newly created dictionary : {'Gfg ': 1, 'Good ': 2, 'CS ': 3, 'Portal ': 4}
Time complexity: O(n*n), where n is the number of key-value pairs in the dictionary.
Auxiliary space: O(n), to store the keys and values in dictionary.
Method #2 : Using eval() This particular problem can be solved using the inbuilt function eval which internally evaluates the string and converts the string to dictionary depending upon the condition.
Python3
# Python3 code to demonstrate working of# Converting String content to dictionary# Using eval()# initializing stringtest_str = "Gfg = 1, Good = 2, CS = 3, Portal = 4"# printing original stringprint("The original string is : " + test_str)# Using eval()# Converting String content to dictionaryres = eval('dict(% s)' % test_str)# printing resultprint("The newly created dictionary : " + str(res)) |
The original string is : Gfg = 1, Good = 2, CS = 3, Portal = 4
The newly created dictionary : {'Gfg': 1, 'Good': 2, 'CS': 3, 'Portal': 4}
Method #3 : Using split(),index() and slicing
Python3
# Python3 code to demonstrate working of# Converting String content to dictionary# initializing stringtest_str = "Gfg = 1, Good = 2, CS = 3, Portal = 4"# printing original stringprint("The original string is : " + test_str)res = dict()x = test_str.split(",")for i in x: a = i[:i.index("=")] b = i[i.index("=")+1:] res[a] = b# printing resultprint("The newly created dictionary : " + str(res)) |
The original string is : Gfg = 1, Good = 2, CS = 3, Portal = 4
The newly created dictionary : {'Gfg ': ' 1', ' Good ': ' 2', ' CS ': ' 3', ' Portal ': ' 4'}
