On 5/7/2016 1:01 PM, Chris Angelico wrote:
On Sun, May 8, 2016 at 2:51 AM, DFS <nos...@dfs.com> wrote:
[1]
pylint says "Consider using enumerate instead of iterating with range and
len"
the offending code is:
for j in range(len(list1)):
do something with list1[j], list2[j], list3[j], etc.
enumeration would be:
for j,item in enumerate(list1):
do something with list1[j], list2[j], list3[j], etc.
Is there an advantage to using enumerate() here?
The suggestion from a human would be to use zip(), or possibly to
change your data structures.
Happens like this:
address data is scraped from a website:
names = tree.xpath()
addr = tree.xpath()
I want to store the data atomically, so I parse street, city, state, and
zip into their own lists.
"1250 Peachtree Rd, Atlanta, GA 30303
street = [s.split(',')[0] for s in addr]
city = [c.split(',')[1].strip() for c in addr]
state = [s[-8:][:2] for s in addr]
zipcd = [z[-5:] for z in addr]
names = ["Taco Bell", "Wendy's"]
addr = ['928 Buford Dr, Tucker, GA 30043', '4880 Ptree Pkwy, Atlanta,
GA 30303']
street = ['928 Buford Dr', '4880 Sugarloaf Pkwy']
city = ['Tucker','Atlanta']
state = ['GA','GA']
zipcd = ['30043','30303']
When you say 'possibly change data structures'... to what?
for item1, item2, item3 in zip(list1, list2, list3):
do something with the items
ziplists = zip(names,street,city,state,zipcd)
print ziplists
[('Taco Bell', '928 Buford Dr', 'Tucker', 'GA', '30043'),
("Wendy's", '4880 Sugarloaf Pkwy', 'Atlanta', 'GA', '30303')]
Why is it better to zip() them up and use:
for item1, item2, item3 in zip(list1, list2, list3):
do something with the items
than
for j in range(len(list1)):
do something with list1[j], list2[j], list3[j], etc.
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