# Python | Construct string from character frequency tuple

Sometimes, while working with data, we can have a problem in which we need to perform construction of string in a way that we have a list of tuple having character and it’s corresponding frequency and we require to construct a new string from that. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is brute force method in which this task can be performed. In this, we iterate the list and perform string concatenation using * operator and keep building string this way.

 `# Python3 code to demonstrate working of ` `# String construction from character frequency ` `# using loop ` ` `  `# initialize list  ` `test_list ``=` `[(``'g'``, ``4``), (``'f'``, ``3``), (``'g'``, ``2``)] ` ` `  `# printing original list  ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `# String construction from character frequency ` `# using loop ` `res ``=` `'' ` `for` `char, freq ``in` `test_list: ` `    ``res ``=` `res ``+` `char ``*` `freq ` ` `  `# printing result ` `print``(``"The constructed string is : "` `+` `str``(res)) `

Output :

```The original list : [('g', 4), ('f', 3), ('g', 2)]
The constructed string is : ggggfffgg
```

Method #2 : Using `join()` + list comprehension
The combination of above functionalities can be used to perform this task. In this, we perform the task of extraction using list comprehension and making string using join().

 `# Python3 code to demonstrate working of ` `# String construction from character frequency ` `# using join() + list comprehension ` ` `  `# initialize list  ` `test_list ``=` `[(``'g'``, ``4``), (``'f'``, ``3``), (``'g'``, ``2``)] ` ` `  `# printing original list  ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `# String construction from character frequency ` `# using join() + list comprehension ` `res ``=` `''.join(char ``*` `freq ``for` `char, freq ``in` `test_list) ` ` `  `# printing result ` `print``(``"The constructed string is : "` `+` `str``(res)) `

Output :

```The original list : [('g', 4), ('f', 3), ('g', 2)]
The constructed string is : ggggfffgg
```

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