Convert List Of Dictionary into String - Python
Last Updated :
23 Jan, 2025
In Python, lists can contain multiple dictionaries, each holding key-value pairs. Sometimes, we need to convert a list of dictionaries into a single string. For example, given a list of dictionaries [{‘a’: 1, ‘b’: 2}, {‘c’: 3, ‘d’: 4}], we may want to convert it into a string that combines the contents of all dictionaries, like "{'a': 1, 'b': 2}{'c': 3, 'd': 4}". Let's discuss various ways to do this.
Using List Comprehension and join()
This method uses list comprehension to iterate through each dictionary in the list, converts each dictionary to a string and then joins them into a single string.
Python
a = [{'a': 1, 'b': 2}, {'c': 3, 'd': 4}]
b = ''.join([str(d) for d in a])
print(b)
Output{'a': 1, 'b': 2}{'c': 3, 'd': 4}
Explanation:
- List comprehension is used to convert each dictionary in the list to a string.
- join() method is used to concatenate the string representations of all dictionaries into a single string.
- The result is a string containing all dictionaries concatenated together.
Let's explore some more ways and see how we can convert list of dictionary into string.
Using for Loop
In this method, we use a for loop to iterate through each dictionary and manually concatenate the string representation of each dictionary.
Python
a = [{'a': 1, 'b': 2}, {'c': 3, 'd': 4}]
b = ""
for d in a:
b += str(d)
print(b)
Output{'a': 1, 'b': 2}{'c': 3, 'd': 4}
Explanation:
- A for loop is used to iterate over each dictionary in the list.
- Each dictionary is converted to a string and concatenated to the variable b.
- The final result is a string with all dictionaries concatenated.
Using map() and join()
map() function can be used to apply str() function to each dictionary in the list and then join() is used to concatenate the results.
Python
a = [{'a': 1, 'b': 2}, {'c': 3, 'd': 4}]
b = ''.join(map(str, a))
print(b)
Output{'a': 1, 'b': 2}{'c': 3, 'd': 4}
Explanation:
- map() function applies the str function to each dictionary in the list.
- join() is then used to concatenate the string representations of all dictionaries into a single string.
- The result is a string combining all dictionaries.
Using JSON Module
This method uses Python's json module to convert each dictionary into a JSON string and then joins these JSON strings into a final result.
Python
import json
a = [{'a': 1, 'b': 2}, {'c': 3, 'd': 4}]
b = ''.join([json.dumps(d) for d in a])
print(b)
Output{"a": 1, "b": 2}{"c": 3, "d": 4}
Explanation:
- json.dumps() converts each dictionary to a JSON string.
- List comprehension is used to apply json.dumps() to each dictionary.
- join() method is used to concatenate the resulting JSON strings into one string.
In this method, str.format() is used to manually format each dictionary into a string and then concatenate them.
Python
a = [{'a': 1, 'b': 2}, {'c': 3, 'd': 4}]
b = ""
for d in a:
b += "{}".format(d)
print(b)
Output{'a': 1, 'b': 2}{'c': 3, 'd': 4}
Explanation:
- A loop is used to iterate through each dictionary in the list.
- str.format() method is used to convert each dictionary to a string and concatenate them.
- The final result is a string with all dictionaries concatenated.
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