Python - Read For Learn

How to execute a program or call a system command?

Use the subprocess module in the standard library: The advantage of subprocess.run over os.system is that it is more flexible (you can get the stdout, stderr, the “real” status code, better error handling, etc…). Even the documentation for os.system recommends using subprocess instead: The subprocess module provides more powerful facilities for spawning new processes and retrieving their results; using that module is preferable to using this function. See the Replacing Older Functions with … Read more

raw_input function in Python

It presents a prompt to the user (the optional arg of raw_input([arg])), gets input from the user and returns the data input by the user in a string. See the docs for raw_input(). Example: This differs from input() in that the latter tries to interpret the input given by the user; it is usually best to avoid input() and to stick with raw_input() and custom … Read more

Difference between import numpy and import numpy as np

numpy is the top package name, and doing import numpy doesn’t import submodule numpy.f2py. When you do import numpy it creats a link that points to numpy, but numpy is not further linked to f2py. The link is established when you do import numpy.f2py In your above code: Here is the difference between import numpy.f2py and import numpy.f2py as myf2py: import numpy.f2py put numpy into local symbol table(pointing to numpy), and … Read more

TypeError: not all arguments converted during string formatting python

ou’re mixing different format functions. The old-style % formatting uses % codes for formatting: The new-style {} formatting uses {} codes and the .format method Note that with old-style formatting, you have to specify multiple arguments using a tuple: In your case, since you’re using {} format specifiers, use .format:

Does Python have a string ‘contains’ substring method?

You can use the in operator:

Best way to convert string to bytes in Python 3?

If you look at the docs for bytes, it points you to bytearray: bytearray([source[, encoding[, errors]]]) Return a new array of bytes. The bytearray type is a mutable sequence of integers in the range 0 <= x < 256. It has most of the usual methods of mutable sequences, described in Mutable Sequence Types, as well as … Read more

ImportError: No module named tensorflow

Try installing tensorflow again with the whatever version you want and with option –ignore-installed like:

Pythonic way to create a long multi-line string

Are you talking about multi-line strings? Easy, use triple quotes to start and end them. You can use single quotes too (3 of them of course at start and end) and treat the resulting string s just like any other string. NOTE: Just as with any string, anything between the starting and ending quotes becomes part of … Read more

Best way to convert string to bytes in Python 3?

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