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Check if a item exist in stack or not (#1931)

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* Check if a item exist in stack or not

* implemented __contains__ method in stack

* made changes in __contains__
This commit is contained in:
Akash 2020-05-03 19:45:31 +05:30 committed by GitHub
parent 853741e518
commit b6fcee3114
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1 changed files with 9 additions and 1 deletions
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8
data_structures/stacks/stack.py
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@ -47,6 +47,10 @@ class Stack:
""" Return the size of the stack.""" """ Return the size of the stack."""
return len(self.stack) return len(self.stack)
def __contains__(self, item) -> bool:
"""Check if item is in stack"""
return item in self.stack
class StackOverflowError(BaseException): class StackOverflowError(BaseException):
pass pass
@ -66,3 +70,7 @@ if __name__ == "__main__":
print("After push(100), the stack is now: " + str(stack)) print("After push(100), the stack is now: " + str(stack))
print("is_empty(): " + str(stack.is_empty())) print("is_empty(): " + str(stack.is_empty()))
print("size(): " + str(stack.size())) print("size(): " + str(stack.size()))
num = 5
if num in stack:
print(f"{num} is in stack")