This recipe shows a few examples of doing method chaining in Python.
Python, 63 lines
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Program: string_processor.py
Demo of method chaining in Python.
By: Vasudev Ram -
http://jugad2.blogspot.in/p/about-vasudev-ram.html
Copyright 2016 Vasudev Ram
'''
import copy
class StringProcessor(object):
'''
A class to process strings in various ways.
'''
def __init__(self, st):
'''Pass a string for st'''
self._st = st
def lowercase(self):
'''Make lowercase'''
self._st = self._st.lower()
return self
def uppercase(self):
'''Make uppercase'''
self._st = self._st.upper()
return self
def capitalize(self):
'''Make first char capital (if letter); make other letters lower'''
self._st = self._st.capitalize()
return self
def delspace(self):
'''Delete spaces'''
self._st = self._st.replace(' ', '')
return self
def rep(self):
'''Like Python's repr'''
return self._st
def dup(self):
'''Duplicate the object'''
return copy.deepcopy(self)
def process_string(s):
print
sp = StringProcessor(s)
print 'Original:', sp.rep()
print 'After uppercase:', sp.dup().uppercase().rep()
print 'After lowercase:', sp.dup().lowercase().rep()
print 'After uppercase then capitalize:', sp.dup().uppercase().\
capitalize().rep()
print 'After delspace:', sp.dup().delspace().rep()
def main():
print "Demo of method chaining in Python:"
# Use extra spaces between words to show effect of delspace.
process_string('hOWz It GoInG?')
process_string('The QUIck brOWn fOx')
main()
|
The recipe shows a simple way to implement method chaining in Python, and mentions a few possible benefits.
There is more discussion and sample output at this page:
http://jugad2.blogspot.in/2016/02/examples-of-method-chaining-in-python.html
