Why am I getting “IndentationError: expected an indented block”? [duplicate]
As the error message indicates, you have an indentation error. It is probably caused by a mix of tabs and spaces.
Python
How do I get the number of elements in a list?
The len() function can be used with several different types in Python – both built-in types and library types. For example:
How to uninstall a package installed with pip install –user
Having tested this using Python 3.5 and pip 7.1.2 on Linux, the situation appears to be this: pip install –user somepackage installs to $HOME/.local, and uninstalling it does work using pip uninstall somepackage. This is true whether or not somepackage is also installed system-wide at the same time. If the package is installed at both … Read more
Writing a pandas DataFrame to CSV file
To delimit by a tab you can use the sep argument of to_csv: To use a specific encoding (e.g. ‘utf-8’) use the encoding argument:
TypeError: a bytes-like object is required, not ‘str’ when writing to a file in Python3
You opened the file in binary mode: This means that all data read from the file is returned as bytes objects, not str. You cannot then use a string in a containment test: You’d have to use a bytes object to test against tmp instead: or open the file as a textfile instead by replacing … Read more
How to convert list to string [duplicate]
This question already has answers here: How to concatenate items in a list to a single string? How can I convert a list to a string using Python?
What does the “yield” keyword do?
To understand what yield does, you must understand what generators are. And before you can understand generators, you must understand iterables. Iterables When you create a list, you can read its items one by one. Reading its items one by one is called iteration: mylist is an iterable. When you use a list comprehension, you … Read more
‘python’ is not recognized as an internal or external command [duplicate]
You need to add that folder to your Windows Path: https://docs.python.org/2/using/windows.html Taken from this question.
ValueError: setting an array element with a sequence
From the code you showed us, the only thing we can tell is that you are trying to create an array from a list that isn’t shaped like a multi-dimensional array. For example or will yield this error message, because the shape of the input list isn’t a (generalised) “box” that can be turned into … Read more
Purpose of “%matplotlib inline”
%matplotlib is a magic function in IPython. I’ll quote the relevant documentation here for you to read for convenience: IPython has a set of predefined ‘magic functions’ that you can call with a command line style syntax. There are two kinds of magics, line-oriented and cell-oriented. Line magics are prefixed with the % character and work much like … Read more