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Update python.html.markdown

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range() is not a generator in python 2.x
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Shashwat986
2014-08-05 01:06:54 +05:30
parent a0af5e9a7b
commit 65a1b6279f
1 changed files with 6 additions and 4 deletions
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python.html.markdown
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@@ -523,11 +523,13 @@ def double_numbers(iterable):
# Instead of generating and returning all values at once it creates one in each # Instead of generating and returning all values at once it creates one in each
# iteration. This means values bigger than 15 wont be processed in # iteration. This means values bigger than 15 wont be processed in
# double_numbers. # double_numbers.
# Note range is a generator too. Creating a list 1-900000000 would take lot of # Note xrange is a generator that does the same thing range does.
# time to be made # Creating a list 1-900000000 would take lot of time and space to be made.
_range = range(1, 900000000) # xrange creates an xrange generator object instead of creating the entire list like range does.
_xrange = xrange(1, 900000000)
# will double all numbers until a result >=30 found # will double all numbers until a result >=30 found
for i in double_numbers(_range): for i in double_numbers(_xrange):
print(i) print(i)
if i >= 30: if i >= 30:
break break