How do I list all files of a directory?
How can I list all files of a directory in Python and add them to a list?
python
ImportError: No module named matplotlib.pyplot
You have two pythons installed on your machine, one is the standard python that comes with Mac OSX and the second is the one you installed with ports (this is the one that has matplotlib installed in its library, the one that comes with macosx does not). Is the standard mac python and since it … Read more
Converting string into datetime
datetime.strptime is the main routine for parsing strings into datetimes. It can handle all sorts of formats, with the format determined by a format string you give it: The resulting datetime object is timezone-naive. Links: Python documentation for strptime: Python 2, Python 3 Python documentation for strptime/strftime format strings: Python 2, Python 3 strftime.org is … Read more
ValueError: could not convert string to float: id
Obviously some of your lines don’t have valid float data, specifically some line have text id which can’t be converted to float. When you try it in interactive prompt you are trying only first line, so best way is to print the line where you are getting this error and you will know the wrong … Read more
working of \n in python [duplicate]
There are two functions that give an object’s string representation, repr() and str(). The former is designed to convert the object to as-code string, while the latter gives user-friendly string. When you input the variable name in the command line, repr() is used, and \n character is shown as \n (as-code). When you use print, … Read more
How to use “raise” keyword in Python [duplicate]
It has 2 purposes. yentup has given the first one. It’s used for raising your own errors. The second is to reraise the current exception in an exception handler, so that it can be handled further up the call stack.
Replace ‘ with \’ in a string
You have to escape the “\”: “\” is an escape sequence indicator, which, to be used as a normal char, has to be escaped (by) itself.
How do I install pip on macOS or OS X?
I spent most of the day yesterday searching for a clear answer for installing pip (package manager for Python). I can’t find a good solution. How do I install it?
ValueError: invalid literal for int() with base 10: ”
110 I am creating a program that reads a file and if the first line of the file is not blank, it reads the next four lines. Calculations are performed on those lines and then the next line is read. If that line is not empty it continues. However, I am getting this error: ValueError: … Read more
How do you get the logical xor of two variables in Python?
If you’re already normalizing the inputs to booleans, then != is xor.