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TheAlgorithmsInPython/data_structures/stacks/__init__.py at master · unconnect/TheAlgorithmsInPython · GitHub
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master
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TheAlgorithmsInPython
/
data_structures
/
stacks
/
__init__.py
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22 lines (18 loc) · 467 Bytes
master
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TheAlgorithmsInPython
/
data_structures
/
stacks
/
__init__.py
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class
Stack
:
def
__init__
(
self
):
self
.
stack
=
[]
self
.
top
=
0
def
is_empty
(
self
):
return
self
.
top
==
0
def
push
(
self
,
item
):
if
self
.
top
<
len
(
self
.
stack
):
self
.
stack
[
self
.
top
]
=
item
else
:
self
.
stack
.
append
(
item
)
self
.
top
+=
1
def
pop
(
self
):
if
self
.
is_empty
():
return
None
else
:
self
.
top
-=
1
return
self
.
stack
[
self
.
top
]
You can’t perform that action at this time.
