 # Partial Functions in Python

## Partial Functions in Python

Partial functions allow us to fix a certain number of arguments of a function and generate a new function.

Example:

 `from` `functools ``import` `partial` ` ` `# A normal function` `def` `f(a, b, c, x):` `    ``return` `1000``*``a ``+` `100``*``b ``+` `10``*``c ``+` `x` ` ` `# A partial function that calls f with` `# a as 3, b as 1 and c as 4.` `g ``=` `partial(f, ``3``, ``1``, ``4``)` ` ` `# Calling g()` `print``(g(``5``))`

Output:

```3145
```

In the example we have pre-filled our function with some constant values of a, b and c. And g() just takes a single argument i.e. the variable x.

Another Example :

 `from` `functools ``import` `*` ` ` `# A normal function` `def` `add(a, b, c):` `    ``return` `100` `*` `a ``+` `10` `*` `b ``+` `c` ` ` `# A partial function with b = 1 and c = 2` `add_part ``=` `partial(add, c ``=` `2``, b ``=` `1``)` ` ` `# Calling partial function` `print``(add_part(``3``))`

Output:

```312
```
• Partial functions can be used to derive specialized functions from general functions and therefore help us to reuse our code.
• This feature is similar to bind in C++.

Last Updated on November 13, 2021 by admin

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