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How-to articles, tricks, and solutions about PYTHON

Why is "1000000000000000 in range(1000000000000001)" so fast in Python 3?

The range() function generates a sequence of numbers, starting from the first argument, and ending before the second argument.

python performance python-3.x range python-internals

Why is it string.join(list) instead of list.join(string)?

The join() method is a string method, so it is called on a string object and takes a list of strings as its argument.

string list python

Why is python setup.py saying invalid command 'bdist_wheel' on Travis CI?

The error message "invalid command 'bdist_wheel'" occurs when the "bdist_wheel" module is not installed.

python pypi setup.py travis-ci

Why is reading lines from stdin much slower in C++ than Python?

Reading from stdin can be slower in C++ than in Python for a few reasons:

python c++ benchmarking iostream getline

Why use pip over easy_install?

Pip is generally preferred over easy_install because it offers a number of features that easy_install does not, including better package management and more user-friendly command options.

python pip pypi setuptools easy-install

Working with UTF-8 encoding in Python source

Here is a code snippet that demonstrates how to work with UTF-8 encoding in a Python source file:

encoding UTF-8 python character-encoding

Writing a list to a file with Python, with newlines

Here is a code snippet that demonstrates how to write a list to a file with newlines in Python:

file list newline python file-io

Writing a pandas DataFrame to CSV file

In the above code snippet, the to_csv method is used to write a DataFrame to a CSV file.

python csv pandas dataframe

Writing string to a file on a new line every time

Here is an example code snippet for writing a string to a file on a new line every time in Python:

newline python