If you have a list with 53 items, the last one is thelist[52] because indexing starts at 0. IndexError Attribution to Real Python: Understanding the Python Traceback – IndexError The IndexError is raised when attempting to retrieve an index from a sequence (e.g. list, tuple), and the index isn’t found in the sequence. The Python … Read more
Use !=. See comparison operators. For comparing object identities, you can use the keyword is and its negation is not. e.g.
You can use the in operator:
As for your first question: that code is perfectly fine and should work if item equals one of the elements inside myList. Maybe you try to find a string that does not exactly match one of the items or maybe you are using a float value which suffers from inaccuracy. As for your second question: … Read more
This should be as simple as: From The Documentation: Do not use os.linesep as a line terminator when writing files opened in text mode (the default); use a single ‘\n’ instead, on all platforms. Some useful reading: The with statement open() ‘a’ is for append, or use ‘w’ to write with truncation os (particularly os.linesep)
If you are using windows then go to C: and search for python. A folder with user version number will be shown like ‘Python37’. Open the folder and you’ll see a folder named Scripts, open that, then you’ll find pip.exe. Now copy the folder path and open ‘Edit the system environment variables’ in control panel. … Read more
DataFrame.reset_index is what you’re looking for. If you don’t want it saved as a column, then do: If you don’t want to reassign:
Just assign it to the .columns attribute:
The *args and **kwargs is a common idiom to allow arbitrary number of arguments to functions as described in the section more on defining functions in the Python documentation. The *args will give you all function parameters as a tuple: The **kwargs will give you all keyword arguments except for those corresponding to a formal parameter as a dictionary. Both idioms can be mixed with normal arguments to … Read more
On Linux at least, there’s no difference as far as I can tell. Here’s a test script and its corresponding OS syscalls (using strace); tested on python 2.7.9. See http://man7.org/linux/man-pages/man2/open.2.html for more details on the file access and creation flags. It’s not accurate to say a file object opened with ‘r+’ cannot be used to truncate a file – … Read more