"Cute Python" reading notes (iv)

keep denying yourself, but stick to the original will.

Small White has implemented the "store the disc content index as a *.cdc text file on your hard disk" and obtained a command-line tool-like program that can be called from the command linepython pycdc.pyw -e  test .txtQuickly specify a file name.

Like grep, now to implement the search function, open all the required files, read each row, if there is a specified keyword in line to print output to the screen ...

Combined with existing experience, can be very simple to achieve!

# -*- coding: utf-8 -*-import osdef cdcgrep (Cdcpath, keyword):     filelist = os.listdir (Cdcpath)         #  Search for files in directory     for cdc in filelist:                   #  Loop file List          if  ". CDC"  in cdc:                  #  filter other files, just focus on .cdc             print (' Find target file: {} '. Format (CDC))              cdcfile = open (CDCPATH + CDC)         #  stitching file path and opening file             for line  in cdcfile.rEadlines ():    #  reads each line of the file and loops                  if keyword in line:              #  determine if there is a keyword in the row                      print (line)                      cdcgrep ( ' f:\\back\\ ',  ' images ')

The above code can scan the "images" line with the keyword ". CDC" in the name under "F:\back\" in the specified directory.

The results of the operation are as follows:

Locate the target file: TEST1.CDC E:\iso\CentOS-6.8-x86_64-bin-DVD1\images; [' Pxeboot ']; [' efiboot.img ', ' efidisk.img ', ' install.img ', ' TRANS. TBL '] E:\iso\CentOS-6.8-x86_64-bin-DVD1\images\pxeboot; []; [' initrd.img ', ' TRANS. TBL ', ' vmlinuz '] find the target file: TEST2.CDC E:\iso\CentOS-6.8-x86_64-bin-DVD1; [' EFI ', ' images ', ' isolinux ', ' [BOOT] '; ['. Discinfo ', '. Treeinfo ', ' centos_buildtag ', ' EULA ', ' GPL ', ' release-notes-en-us.html ', ' rpm-gpg-key-centos-6 ', ' Rpm-gpg-key-centos-debug-6 ', ' rpm-gpg-key-centos-security-6 ', ' rpm-gpg-key-centos-testing-6 ', ' TRANS. TBL '] E:\iso\CentOS-6.8-x86_64-bin-DVD1\images; [' Pxeboot ']; [' efiboot.img ', ' efidisk.img ', ' install.img ', ' TRANS. TBL ']

In the grep implementation example above, the processing of subdirectories is not considered, because an error occurs if the direct Open Directory is read. The next step is to improve this code to take into account the special circumstances of subdirectories.

# -*- coding: utf-8 -*-import osdef cdcgrep (Cdcpath, keyword):     expdict = {}    filelist = os.listdir (Cdcpath)           #  Search for files in directory     cdcpath = cdcpath  +  "\"     for cdc in filelist:                    #  Loop file List          if os.path.isdir (CDCPATH+CDC):             print (CDCPATH+CDC)              cdcgrep (Cdcpath+cdc, keyword)   #  if subdirectory, recursive call complete Find          else:            if  Cdc.endswith ('. CDC '): &NBSp;               print (CDC)                  cdcfile =  Open (CDCPATH + CDC)       #  flattened file path and opens file                  for line in  Cdcfile.readlines ():   #  read each line of the file and follow the bad                       if keyword in line:             #  determine if there is a keyword in the row                           print (line)                           cdcgrep (' f:\\back\\ ',  ' images ') 

The result of the operation is as follows:

Search subdirectories F:\back\\1 Locate the target file:test1.cdc e:\iso\centos-6.8-x86_64-bin-dvd1\images; [' Pxeboot ']; [' efiboot.img ',  ' efidisk.img ',  ' install.img ',  ' TRANS. TBL '] e:\iso\centos-6.8-x86_64-bin-dvd1\images\pxeboot; []; [' initrd.img ',  ' TRANS. TBL ',  ' vmlinuz '] Search subdirectories F:\back\\2 Locate the target file:test2.cdc e:\iso\centos-6.8-x86_64-bin-dvd1; [' EFI ',  ' images ',  ' isolinux ',  ' [BOOT] '; ['. Discinfo ',  '. Treeinfo ',  ' centos_buildtag ',  ' EULA ',  ' GPL ',  ' Release-notes-en-us.html ',  ' rpm-gpg-key-centos-6 ',  ' rpm-gpg-key-centos-debug-6 ',  ' Rpm-gpg-key-centos-security-6 ',  ' rpm-gpg-key-centos-testing-6 ',  ' TRANS. TBL '] e:\iso\centos-6.8-x86_64-bin-dvd1\images\pxeboot; []; [' initrd.img ',  ' TRANS. TBL ',  ' vmlinuz '] Find the target file:test3.cdc e:\iso\centos-6.8-x86_64-bin-dvd1; [' EFI ',  ' images ',  ' isolinux ',  ' [BOOT] '; ['. Discinfo ',  '. Treeinfo ',  ' centos_buildtag ',  ' EULA ',  ' GPL ',  ' Release-notes-en-us.html ',  ' Rpm-gpg-key-centos-6 ',  ' rpm-gpg-key-centos-debug-6 ',  ' rpm-gpg-key-centos-security-6 ',  ' Rpm-gpg-key-centos-testing-6 ',  ' TRANS. TBL '] e:\iso\centos-6.8-x86_64-bin-dvd1\images; [' Pxeboot ']; [' efiboot.img ',  ' efidisk.img ',  ' install.img ',  ' TRANS. TBL ']

This sub-directory processing, using recursive call Cdcgrep () to implement.

Summary: This section implements the search function and learns the recursive invocation of the function.

"Cute Python" reading notes (iv)