On 3/17/2010 8:02 AM Karjer Jdfjdf said...
I'm having problems with iterations and loops. So I'm curious about the best
Python-way to do iterations of lists (in if, while etc statements) and breaking
of loops.
I have a list of tuples with 2 values. I want to perform calculations on all of
these for each value in a range of values (e.g. 100 to 110).
list_of_tuples = [(90629, 4644), (90706, 4617), (90729, 4709)]
#start value
n = 100
#maximum value
nmax = 110
#First I create a list for the values
range_list = []
while n< int(nmax+1):
range_list.append(n)
n = n + 1
print range_list
Look up the documentation for range -- there is an easier answer.
for i in range_list:
for t in list_of_tuples:
val1 = t[0]
val2 = t[1]
you can also unpack a tuple like:
for val1,val2 in list_of_tuples:
print "do stuff with\t" + str(val1) + '\t' + str(val2) + \
'\tfor rangevalue\t' + str(i)
But I think that the rangelist is not needed and it can be done better (and
faster for large quantities of data). I think it's better to have somethng like
the code below. But I'm having problems with breaking the second loop and
returning to the first loop. If I put in another while-statement befor the
for-statement it stops after 1 run and it has to continue until the end of the
range.
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