CODEWITHSUNDEEP
pythonpython-2.7
Gonz
Gonz

Reputation: 1219

Product of tuple

As a Python newbie, it might be a silly question, but I can't find a solution. I'm doing the product of a tuple, and working perfectly, like this: 

list = list(itertools.product(["this", "the"],["example", "test"],["is not", "isnt"],[" working", "correct"]))
print(list)

But if a declare another variable, it does not work anymore:

test = ["this", "the"],["example", "test"],["is not", "isnt"],[" working", "correct"]
list = list(itertools.product(test))
print(list)

I checked with the type() function to get the class, and it's a tuple...

I'm running this in Python 3.x but I would like to make it compatible for 2.7

Upvotes: 0

Views: 1245

Answers (1)

Marius
Marius

Reputation: 60070

First off, it's bad to use list as a variable name, since this overwrites the default list function.

In your first, working, example, you pass multiple arguments to itertools.product, and it combines each argument to give the output you want. In your nonworking example, you only pass a single argument, the tuple test. Thankfully you can use Python's tuple unpacking syntax to expand each element of the tuple into an argument:

test = ["this", "the"],["example", "test"],["is not", "isnt"],[" working", "correct"]
# The * before test unpacks the tuple into separate arguments
result2 = list(itertools.product(*test))
print(result2)
[('this', 'example', 'is not', ' working'), ('this', 'example', 'is not', 'correct'), ('this', 'example', 'isnt', ' working'), ('this', 'example', 'isnt', 'correct'), ('this', 'test', 'is not', ' working'), ('this', 'test', 'is not', 'correct'), ('this', 'test', 'isnt', ' working'), ('this', 'test', 'isnt', 'correct'), ('the', 'example', 'is not', ' working'), ('the', 'example', 'is not', 'correct'), ('the', 'example', 'isnt', ' working'), ('the', 'example', 'isnt', 'correct'), ('the', 'test', 'is not', ' working'), ('the', 'test', 'is not', 'correct'), ('the', 'test', 'isnt', ' working'), ('the', 'test', 'isnt', 'correct')]

Upvotes: 2

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