Why is "while" ticking me off???
Huaiyu Zhu
hzhu at users.sourceforge.net
Fri Oct 6 13:40:00 EDT 2000
On Fri, 06 Oct 2000 16:13:41 +0100, Alan Gauld <alan.gauld at gssec.bt.co.uk>
wrote:
>Thomas Gagne wrote:
>> while line = fp.readline():
>> do something with 'line'
>>
>> but that doesn't work because Python doesn't allow assignments
>
>correct, so at the expense of typing a line twice, do
>the assignment externally:
The expense could be high in real codes, not just a line or two. See
http://www.geocities.com/huaiyu_zhu/python/ififif.txt
I quote an example here:
if val = dict1[key1]:
process1(val)
elif val = dict2[key2]:
process2(val)
elif val = dict3[key3]:
process3(val)
...
The entirely equivalent python code would require nested ifs
val = dict1[key1]
if val:
process1(val)
else:
val = dict2[key2]
if val:
process2(val)
else:
val = dict3[key3]
if val:
process3(val)
else:
...
Huaiyu
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