Is there a way to convert a list into a string?-CodePudding

import itertools as iter 
numbers = ['0', '1'] 
y = list(iter.product(numbers, repeat=2))
a = ''.join(y)
 
print(a)

When I try to convert y into a string, I join the string 'a' with y. But I keep getting the error "TypeError: sequence item 0: expected str instance, tuple found"

Any solutions?

CodePudding user response：

Your issue is that itertools.product returns an iterator of tuples, so you have to join each of the values in that list:

import itertools

numbers = ['0', '1'] 
y = itertools.product(numbers, repeat=2)
# output of product
# <iterator>(('0', '0'), ('0', '1'), ('1', '0'), ('1', '1'))

a = [''.join(t) for t in y]
a
# ['00', '01', '10', '11']

Note you don't need to convert y to a list to use it in a comprehension.

CodePudding user response：

In your example, y is a list of tuples, each of which contains two one-character strings.

If I'm understanding, I think what you want to do is this:

import itertools as it
numbers = ['0', '1'] 
y = list(it.product(numbers, repeat=2))
a = ''.join(''.join(x) for x in y) 
print(a)

Output:

00011011

An alternative that produces the same result using the chain() function in itertools is:

import itertools as it
numbers = ['0', '1'] 
y = list(it.product(numbers, repeat=2))
a = ''.join(it.chain(*y))
print(a)