Example of using python to count the number of rows

When the file size is very large (above 10 GB), to know the number of rows is a problem, provide an example of using python to count the number of rows of the file. if you need a friend, refer to the following code:

Import time

Def block (file, size = 65536 ):
While True:
Nb = file. read (size)
If not nb:
Break
Yield nb

Def getLineCount (filename ):
With open (filename, "r", encoding = "UTF-8") as f:
Return sum (line. count ("\ n") for line in block (f ))
If _ name _ = "_ main __":
Import sys
Import OS
If len (sys. argv )! = 2:
Print ("error imput argument ")
Sys. exit (-1)
If not OS. path. isfile (sys. argv [1]):
Print (sys. argv + "is not a file ")
Sys. exit (-1)
Start_time = time. time ()
Print (getLineCount (sys. argv [1])
Print (time. time ()-start_time, "seconds ")