CODEWITHSUNDEEP
pythonlistpython-2.7nested
Benjamin James
Benjamin James

Reputation: 961

Generating nested lists with specified lengths

I want to generate a list of lists that contains a progressive number of randomly generated binary values.

How do I add a condition that tells python to add random values to a list until it reaches a specified length? In this case, the length of each new list should be a progressively larger odd number. 

from random import randint  

shape = [] 
odds = [x for x in range(100) if x % 2 == 1]

while len(shape) < 300:
    for x in odds:
        randy = [randint(0,1)] * x ??  # need to run this code x amount of times 
        shape.append(randy)            # so that each len(randy) = x

*I would prefer to not use count += 1

desired output:

shape [[0],[0,1,0],[1,1,0,1,0],[1,0,0,0,1,1,0]...etc]

Upvotes: 1

Views: 143

Answers (1)

Joel Cornett
Joel Cornett

Reputation: 24788

You want a generator expression list comprehension:

randy = [randint(0, 1) for i in range(x)]

The problem with [someFunc()] * someNum is that Python first evaluates the inner expression, someFunc() and resolves it to some number before executing the outer expression.

Upvotes: 5

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