How to create an empty list in python

There are two ways to create a new empty list in Python, as follows:

l = []

or

l = list()

list() is slower than [] , because:

1. There is a symbolic search;

2. There is a function call;

3. Then, it must check whether the iterable parameter is passed.

But in most cases, the speed difference won't have any real impact.

Here's a test of which piece of code is faster:

% python -mtimeit  "l=[]"
10000000 loops, best of 3: 0.0711 usec per loop

% python -mtimeit  "l=list()"
1000000 loops, best of 3: 0.297 usec per loop

I prefer [] because readability is very subjective.

Many python training videos, all on the python learning network, welcome to learn online!

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