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python-patterns/template.py at master · sd2017/python-patterns · GitHub
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template.py
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"""http://ginstrom.com/scribbles/2007/10/08/design-patterns-python-style/
An example of the Template pattern in Python"""
ingredients
=
"spam eggs apple"
line
=
'-'
*
10
# Skeletons
def
iter_elements
(
getter
,
action
):
"""Template skeleton that iterates items"""
for
element
in
getter
():
action
(
element
)
print
(
line
)
def
rev_elements
(
getter
,
action
):
"""Template skeleton that iterates items in reverse order"""
for
element
in
getter
()[::
-
1
]:
action
(
element
)
print
(
line
)
# Getters
def
get_list
():
return
ingredients
.
split
()
def
get_lists
():
return
[
list
(
x
)
for
x
in
ingredients
.
split
()]
# Actions
def
print_item
(
item
):
print
(
item
)
def
reverse_item
(
item
):
print
(
item
[::
-
1
])
# Makes templates
def
make_template
(
skeleton
,
getter
,
action
):
"""Instantiate a template method with getter and action"""
def
template
():
skeleton
(
getter
,
action
)
return
template
# Create our template functions
templates
=
[
make_template
(
s
,
g
,
a
)
for
g
in
(
get_list
,
get_lists
)
for
a
in
(
print_item
,
reverse_item
)
for
s
in
(
iter_elements
,
rev_elements
)]
# Execute them
for
template
in
templates
:
template
()
### OUTPUT ###
# spam
# ----------
# eggs
# ----------
# apple
# ----------
# apple
# ----------
# eggs
# ----------
# spam
# ----------
# maps
# ----------
# sgge
# ----------
# elppa
# ----------
# elppa
# ----------
# sgge
# ----------
# maps
# ----------
# ['s', 'p', 'a', 'm']
# ----------
# ['e', 'g', 'g', 's']
# ----------
# ['a', 'p', 'p', 'l', 'e']
# ----------
# ['a', 'p', 'p', 'l', 'e']
# ----------
# ['e', 'g', 'g', 's']
# ----------
# ['s', 'p', 'a', 'm']
# ----------
# ['m', 'a', 'p', 's']
# ----------
# ['s', 'g', 'g', 'e']
# ----------
# ['e', 'l', 'p', 'p', 'a']
# ----------
# ['e', 'l', 'p', 'p', 'a']
# ----------
# ['s', 'g', 'g', 'e']
# ----------
# ['m', 'a', 'p', 's']
# ----------
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