Currently I would do:
for x in [1,2,3]:
for y in [1,2,3]:
print x,y
Is there way of doing something like below,
for x,y in ([1,2,3],[1,2,3]):
print x,y
Would like to shorten this kind of loop and this throws the "too many to unpack" exception.
num = 224 list1 = [] for i in range(2, num): if num % i == 0: list1. append(i) for i in range(2, num): if num % i == 0: print(num, 'is not prime and can be divided by the following numbers:\n', list1) break else: print(num, 'is Prime. ')
First, Write an outer for loop that will iterate the first list like [for i in first] Next, Write an inner loop that will iterate the second list after the outer loop like [for i in first for j in second] Last, calculate the addition of the outer number and inner number like [i+j for i in first for j in second]
You can combine multiple print statements per line using, in Python 2 and use the end argument to print function in Python 3.
Python for loop index start at 0 In Python by default, the range starts from 0 and ends at the value of the passed argument as -1.
Use itertools.product
import itertools
for x, y in itertools.product([1,2,3], [1,2,3]):
print x, y
prints all nine pairs:
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3
UPDATE: If the two variables x
and y
are to be chosen from one list, you can use the repeat
keyword (as proposed by agf):
import itertools
for x, y in itertools.product([1,2,3], repeat=2):
print x, y
You could use a generator expression in the for loop:
for x, y in ((a,b) for a in [1,2,3] for b in [5,6,7]):
print x, y
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