python filecmp.dircmp實現遞迴比對兩個目錄的方法
阿新 • • 發佈:2020-05-23
使用python filecmp模組的dircmp類可以很方便的比對兩個目錄,dircmp的用法已經有很多文章介紹,不再贅述。
可以help(filecmp.dircmp)檢視幫助資訊,其中提到的x.report()、x.report_partial_closure()
,都只能列印兩目錄一級子目錄的比較資訊。而x.report_full_closure()
可以遞迴列印所有子目錄的比對資訊,但是輸出太多,大多數情況下我們可能只關心兩目錄的不同之處。
help(filecmp.dircmp) 摘選: | High level usage: | x = dircmp(dir1,dir2) | x.report() -> prints a report on the differences between dir1 and dir2 | or | x.report_partial_closure() -> prints report on differences between dir1 | and dir2,and reports on common immediate subdirectories. | x.report_full_closure() -> like report_partial_closure,| but fully recursive.
本文編寫的指令碼,重點關注並實現兩個目標:
1)遞迴比對兩個目錄及其所有子目錄。
2)僅輸出兩目錄不同之處,包括檔名相同(common_files)但是檔案不一致(diff_files),以及左、右目錄中獨有的檔案或子目錄。
py指令碼compare_dir.py內容如下:
# -*- coding: utf-8 -*- """ @desc 使用filecmp.dircmp遞迴比對兩個目錄,輸出比對結果以及統計資訊。 @author longfeiwlf @date 2020-5-20 """ from filecmp import dircmp import sys # 定義全域性變數: number_different_files = 0 # 檔名相同但不一致的檔案數 number_left_only = 0 # 左邊目錄獨有的檔案或目錄數 number_right_only = 0 # 右邊目錄獨有的檔案或目錄數 def print_diff(dcmp): """遞迴比對兩目錄,如果有不同之處,打印出來,同時累加統計計數。""" global number_different_files global number_left_only global number_right_only for name in dcmp.diff_files: print("diff_file found: %s/%s" % (dcmp.left,name)) number_different_files += 1 for name_left in dcmp.left_only: print("left_only found: %s/%s" % (dcmp.left,name_left)) number_left_only += 1 for name_right in dcmp.right_only: print("right_only found: %s/%s" % (dcmp.right,name_right)) number_right_only += 1 for sub_dcmp in dcmp.subdirs.values(): print_diff(sub_dcmp) # 遞迴比較子目錄 if __name__ == '__main__': try: mydcmp = dircmp(sys.argv[1],sys.argv[2]) except IndexError as ie: print(ie) print("使用方法:python compare_dir_cn.py 目錄1 目錄2") else: print("\n比對結果詳情: ") print_diff(mydcmp) if (number_different_files == 0 and number_left_only == 0 and number_right_only == 0): print("\n兩個目錄完全一致!") else: print("\n比對結果統計:") print("Total Number of different files is: " + str(number_different_files)) print("Total Number of files or directories only in '" + sys.argv[1] + "' is: " + str(number_left_only)) print("Total Number of files or directories only in '" + sys.argv[2] + "' is: " + str(number_right_only))
compare_dir.py指令碼使用舉例:
總結
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