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[mypy] Fix type annotations for linked_list/__init__.py #5066

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[mypy] Fix type annotations for linked_list/__init__.py #5066

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224f854
updating DIRECTORY.md
Oct 5, 2021
91b44f2
Fix type annotations for linked_list/__init__.py
archaengel Oct 6, 2021
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3 changes: 3 additions & 0 deletions DIRECTORY.md
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Original file line number Diff line number Diff line change
Expand Up @@ -274,6 +274,7 @@
* [Test Send File](https://github.com/TheAlgorithms/Python/blob/master/file_transfer/tests/test_send_file.py)

## Fractals
* [Julia Sets](https://github.com/TheAlgorithms/Python/blob/master/fractals/julia_sets.py)
* [Koch Snowflake](https://github.com/TheAlgorithms/Python/blob/master/fractals/koch_snowflake.py)
* [Mandelbrot](https://github.com/TheAlgorithms/Python/blob/master/fractals/mandelbrot.py)
* [Sierpinski Triangle](https://github.com/TheAlgorithms/Python/blob/master/fractals/sierpinski_triangle.py)
Expand Down Expand Up @@ -424,10 +425,12 @@
* [Binomial Distribution](https://github.com/TheAlgorithms/Python/blob/master/maths/binomial_distribution.py)
* [Bisection](https://github.com/TheAlgorithms/Python/blob/master/maths/bisection.py)
* [Ceil](https://github.com/TheAlgorithms/Python/blob/master/maths/ceil.py)
* [Check Polygon](https://github.com/TheAlgorithms/Python/blob/master/maths/check_polygon.py)
* [Chudnovsky Algorithm](https://github.com/TheAlgorithms/Python/blob/master/maths/chudnovsky_algorithm.py)
* [Collatz Sequence](https://github.com/TheAlgorithms/Python/blob/master/maths/collatz_sequence.py)
* [Combinations](https://github.com/TheAlgorithms/Python/blob/master/maths/combinations.py)
* [Decimal Isolate](https://github.com/TheAlgorithms/Python/blob/master/maths/decimal_isolate.py)
* [Double Factorial Iterative](https://github.com/TheAlgorithms/Python/blob/master/maths/double_factorial_iterative.py)
* [Double Factorial Recursive](https://github.com/TheAlgorithms/Python/blob/master/maths/double_factorial_recursive.py)
* [Entropy](https://github.com/TheAlgorithms/Python/blob/master/maths/entropy.py)
* [Euclidean Distance](https://github.com/TheAlgorithms/Python/blob/master/maths/euclidean_distance.py)
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17 changes: 10 additions & 7 deletions data_structures/linked_list/__init__.py
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Expand Up @@ -6,28 +6,31 @@
- Last node: points to null
"""

from typing import Any
from typing import Generic, Optional, TypeVar

T = TypeVar("T")

class Node:
def __init__(self, item: Any, next: Any) -> None:

class Node(Generic[T]):
def __init__(self, item: T, next: Optional["Node[T]"]) -> None:
self.item = item
self.next = next


class LinkedList:
class LinkedList(Generic[T]):
def __init__(self) -> None:
self.head = None
self.head: Optional[Node[T]] = None
self.size = 0

def add(self, item: Any) -> None:
def add(self, item: T) -> None:
self.head = Node(item, self.head)
self.size += 1

def remove(self) -> Any:
def remove(self) -> Optional[T]:
if self.is_empty():
return None
else:
assert self.head is not None
item = self.head.item
self.head = self.head.next
self.size -= 1
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