logic - How to sort specific string, in the following situation (PYTHON) -

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i trying build acronym shortner (as beginners project)
link:http://pastebin.com/395ig9ec

explaination:
++acronym block++

if user string variable set "international business machines" return ibm

but in the...

++sorting block++

if user string variable set "light amplification simulated emission of radiation"

i tried split whole sentence by:

 z=string.split(" ")  l=len(z)

then use following loop:
'''|soring block|'''<

for x in range(0,l,1):     esc=z[x]     if (z[x]=="by" or z[x]=="the" or z[x]=="of"):             esc=z[x+1]       emp=emp+" "+esc   print emp

but problem when there 2 consecutive exclusion words python messes up. how solve it?

this takes first letter of each word in sentence, ignores words excluded, , puts letters using join.

#python3 def make_acronym(sentence):     excluded_words = ['by', 'the', 'of']     acronym = ''.join(word[0] word in sentence.split(' ') if word not in excluded_words)     return acronym.upper()

example:

>>> make_acronym('light amplification simulated emission of radiation') 'laser'

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