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README.md: sumab() --> sum_ab() for consistancy (#1855)

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* README.md: sumab() --> sum_ab() for consistancy  

consistency

* fixup! Format Python code with psf/black push

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6
CONTRIBUTING.md
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@ -82,7 +82,7 @@ We want your work to be readable by others; therefore, we encourage you to note
```python ```python
def sum_ab(a, b): def sum_ab(a, b):
""" """
Returns the sum of two integers a and b Return the sum of two integers a and b
>>> sum_ab(2, 2) >>> sum_ab(2, 2)
4 4
>>> sum_ab(-2, 3) >>> sum_ab(-2, 3)
@ -116,8 +116,8 @@ We want your work to be readable by others; therefore, we encourage you to note
The use of [Python type hints](https://docs.python.org/3/library/typing.html) is encouraged for function parameters and return values. Our automated testing will run [mypy](http://mypy-lang.org) so run that locally before making your submission. The use of [Python type hints](https://docs.python.org/3/library/typing.html) is encouraged for function parameters and return values. Our automated testing will run [mypy](http://mypy-lang.org) so run that locally before making your submission.
```python ```python
def sumab(a: int, b: int) --> int: def sum_ab(a: int, b: int) --> int:
pass return a + b
``` ```
- [__List comprehensions and generators__](https://docs.python.org/3/tutorial/datastructures.html#list-comprehensions) are preferred over the use of `lambda`, `map`, `filter`, `reduce` but the important thing is to demonstrate the power of Python in code that is easy to read and maintain. - [__List comprehensions and generators__](https://docs.python.org/3/tutorial/datastructures.html#list-comprehensions) are preferred over the use of `lambda`, `map`, `filter`, `reduce` but the important thing is to demonstrate the power of Python in code that is easy to read and maintain.

6
data_structures/linked_list/middle_element_of_linked_list.py
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@ -8,14 +8,14 @@ class LinkedList:
def __init__(self): def __init__(self):
self.head = None self.head = None
def push(self, new_data:int) -> int: def push(self, new_data: int) -> int:
new_node = Node(new_data) new_node = Node(new_data)
new_node.next = self.head new_node.next = self.head
self.head = new_node self.head = new_node
return self.head.data return self.head.data
def middle_element(self) -> int: def middle_element(self) -> int:
''' """
>>> link = LinkedList() >>> link = LinkedList()
>>> link.middle_element() >>> link.middle_element()
No element found. No element found.
@ -44,7 +44,7 @@ class LinkedList:
>>> link.middle_element() >>> link.middle_element()
12 12
>>> >>>
''' """
slow_pointer = self.head slow_pointer = self.head
fast_pointer = self.head fast_pointer = self.head
if self.head: if self.head: