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Check if a item exist in stack or not #1931

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Merged
merged 3 commits into from May 3, 2020
+9 −1
Merged

Check if a item exist in stack or not #1931

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96f2317
Check if a item exist in stack or not
May 2, 2020
eab47be
implemented __contains__ method in stack
May 3, 2020
4d50f9e
made changes in __contains__
May 3, 2020
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10 changes: 9 additions & 1 deletion data_structures/stacks/stack.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,11 @@ def is_empty(self):
def size(self):
""" Return the size of the stack."""
return len(self.stack)


def __contains__(self, item) -> bool:
"""Check if item is in stack"""
return item in self.stack


class StackOverflowError(BaseException):
pass
Expand All @@ -66,3 +70,7 @@ class StackOverflowError(BaseException):
print("After push(100), the stack is now: " + str(stack))
print("is_empty(): " + str(stack.is_empty()))
print("size(): " + str(stack.size()))
num = 5
if num in stack:
print(f"{num} is in stack")