本文實例講述了Python中subprocess模塊用法。分享給大家供大家參考。具體如下:
執行命令:
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>>> subprocess.call([ "ls" , "-l" ]) 0 >>> subprocess.call( "exit 1" , shell = True ) 1 |
測試調用系統中cmd命令,顯示命令執行的結果:
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x = subprocess.check_output([ "echo" , "Hello World!" ],shell = True ) print (x) "Hello World!" |
測試在python中顯示文件內容:
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y = subprocess.check_output([ "type" , "app2.cpp" ],shell = True ) print (y) #include <iostream> using namespace std; ...... |
查看ipconfig -all命令的輸出,并將將輸出保存到文件tmp.log中:
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handle = open (r 'd:\tmp.log' , 'wt' ) subprocess.Popen([ 'ipconfig' , '-all' ], stdout = handle) |
查看網絡設置ipconfig -all,保存到變量中:
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output = subprocess.Popen([ 'ipconfig' , '-all' ], stdout = subprocess.PIPE,shell = True ) oc = output.communicate() #取出output中的字符串 #communicate() returns a tuple (stdoutdata, stderrdata). print (oc[ 0 ]) #打印網絡信息 Windows IP Configuration Host Name . . . . . |
我們可以在Popen()建立子進程的時候改變標準輸入、標準輸出和標準錯誤,并可以利用subprocess.PIPE將多個子進程的輸入和輸出連接在一起,構成管道(pipe):
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child1 = subprocess.Popen([ "dir" , "/w" ], stdout = subprocess.PIPE,shell = True ) child2 = subprocess.Popen([ "wc" ], stdin = child1.stdout,stdout = subprocess.PIPE,shell = True ) out = child2.communicate() print (out) ( ' 9 24 298\n' , None ) |
如果想頻繁地和子線程通信,那么不能使用communicate();因為communicate通信一次之后即關閉了管道.這時可以試試下面的方法:
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p = subprocess.Popen([ "wc" ], stdin = subprocess.PIPE,stdout = subprocess.PIPE,shell = True ) p.stdin.write( 'your command' ) p.stdin.flush() #......do something try : #......do something p.stdout.readline() #......do something except : print ( 'IOError' ) #......do something more p.stdin.write( 'your other command' ) p.stdin.flush() #......do something more |
希望本文所述對大家的Python程序設計有所幫助。