Category: Python Answers

Sometimes, we want to convert [key1,val1,key2,val2] to a dict with Python.

In this article, we’ll look at how to convert [key1,val1,key2,val2] to a dict with Python.

How to convert [key1,val1,key2,val2] to a dict with Python?

To convert [key1,val1,key2,val2] to a dict with Python, we can use the itertools module’s izip function.

For instance, we write

from itertools import izip

i = iter(a)
b = dict(izip(i, i))

to call iter to convert list a into an iterator.

Then we call izip with i for both arguments to zip the even and odd index entries together.

And then we call dict to convert the iterator to a dict.

Conclusion

To convert [key1,val1,key2,val2] to a dict with Python, we can use the itertools module’s izip function.

Sometimes, we want to retrieve the output of subprocess.call() with Python.

In this article, we’ll look at how to retrieve the output of subprocess.call() with Python.

How to retrieve the output of subprocess.call() with Python?

To retrieve the output of subprocess.call() with Python, we call subprocess.check_output.

For instance, we write

import subprocess

print(subprocess.check_output(["ping", "-c", "1", "8.8.8.8"]))

to call subprocess.check_output with a list that has the command and command arguments.

And then we get the output from the returned string.

Conclusion

To retrieve the output of subprocess.call() with Python, we call subprocess.check_output.

Sometimes, we want to print list without brackets in a single row with Python.

In this article, we’ll look at how to print list without brackets in a single row with Python.

How to print list without brackets in a single row with Python?

To print list without brackets in a single row with Python, we call join to join the items in the list into one string.

For instance, we write

print(', '.join(names))

to call join with names to combine the items in the names list into 1 string with each item separated by commas.

Conclusion

To print list without brackets in a single row with Python, we call join to join the items in the list into one string.

Sometimes, we want to fix PATH issue with pytest ‘ImportError: No module named error with Python.

In this article, we’ll look at how to fix PATH issue with pytest ‘ImportError: No module named error with Python.

How to fix PATH issue with pytest ‘ImportError: No module named error with Python?

To fix PATH issue with pytest ‘ImportError: No module named error with Python, we should set the PYTHONPATH variable to the Python executable path.

For instance, we run

python -m pytest tests/

to run pytest on the tests folder with python -m to Python add the current directory in the PYTHONPATH environment variable.

Conclusion

To fix PATH issue with pytest ‘ImportError: No module named error with Python, we should set the PYTHONPATH variable to the Python executable path.

Sometimes, we want to fill out a Python string with spaces.

In this article, we’ll look at how to fill out a Python string with spaces.

How to fill out a Python string with spaces?

To fill out a Python string with spaces, we can use the string ljust method.

For instance, we write

s = 'hi'.ljust(10)

to call ljust with 10 on 'hi' to pad 'hi' into length 10 with spaces.

Conclusion

To fill out a Python string with spaces, we can use the string ljust method.