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Use a list of values to select rows from a Pandas dataframe In the OP, the values in list_of_values don't appear in that order in df If you want df to return in the order they appear in list_of_values, i e "sort" by list_of_values, use loc
How do I get the row count of a Pandas DataFrame? could use df info () so you get row count (# entries), number of non-null entries in each column, dtypes and memory usage Good complete picture of the df If you're looking for a number you can use programatically then df shape [0]
How do I determine the total size of a directory (folder) from the . . . 1233 Is there a simple command to display the total aggregate size (disk usage) of all files in a directory (folder)? I have tried these, and they don't do what I want: ls -l, which only displays the size of the individual files in a directory, nor df -h, which only displays the free and used space on my disks
How to add an empty column to a dataframe? - Stack Overflow There is another way to add an new column to an existing dataframe 1st step, make a new empty data frame (with all the columns in your data frame, plus a new or few columns you want to add) called df_temp 2nd step, combine the df_temp and your data frame
Why do df and du commands show different disk usage? 15 Ok, lets check the man pages: df - report file system disk space usage and du - estimate file space usage Those two tools were meant for different propose While df is to show the file system usage, du is to report the file space usage du works from files while df works at filesystem level, reporting what the kernel says it has available
Count the frequency that a value occurs in a dataframe column df groupby('a') count() doesn't work if you have multiple columns It will give you a ncol x nvals dataframe That's nice when you only have one column, but when you have 10's or 100's of columns, the result is probably not what you are looking for
What do I do when my root filesystem is full? - Ask Ubuntu My folder is reading as full and I can't update software or do anything Not sure what I'm doing wrong here $ df -h Results: Filesystem Size Used Avail Use% Mounted on dev sda1