Python Print List Without Truncating

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How to Print a List Without Truncating?

Per default, Python doesn’t truncate lists when printing them to the shell, even if they are large. For example, you can call print(my_list) and see the full list even if the list has one thousand elements or more!

Here’s an example:

However, Python may squeeze the text (e.g., in programming environments such as IDLE) so you would have to press the button before seeing the output. The reason is that showing the whole output could be time-consuming and visually cluttering.

Here’s an example:

How to Print a NumPy Array Without Truncating?

In many cases, large NumPy arrays when printed out are not truncated as well on the default Python programming environment IDLE:

However, in the interactive mode of the Python shell, a NumPy array may be truncated, unlike a Python list:

>>> np.arange(10000)
array([   0,    1,    2, ..., 9997, 9998, 9999])

To print the NumPy array without truncating, simply

>>> import sys, numpy
>>> numpy.set_printoptions(threshold=sys.maxsize)
>>> np.arange(10000)

The output shows the full array without converting it to a list first:

Not all output is shown to save some space. 🙂

Of course, you could also convert the NumPy array to a Python list first.

👉 Recommended Tutorial: How to Print a NumPy Array Without Truncating It?

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