Frequently used(referred) Python code

개인적으로 자주 쓰거나 참조하는 Python Code 를 정리해 보았다.

File

read lines with line separator

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fpin = open(inputFile)   for fline in fpin:     print 'line text with newline : ', fline

 

read lines without line separator

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fpin = open(inputFile) flines = fpin.splitlines()   for fline in fpin:     print 'line text without newline : ', fline

File path concatenation

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outDir = 'testDir' outUserName = 'test1' outFile = 'testFile.txt'   # testDir/test1/testFile.txt outFullPath = os.path.join(outDir, outUserName, outFile)

Get Filename list

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def getFileNameList( targetDir, fileNameList ):     for root, subFolders, files in os.walk(targetDir):         for fileName in files:             fileNameList.append(fileName)

Create directory if it doesn’t exist

1 2	if not os.path.exists(targetDir):     os.makedirs(targetDir)

 

 

String operations

format

1	tmpStr = '%s : %d' % ('Format Test', 777)

 Fast string concatenation

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# Warning : Do not use += operator when you concatenate strings. It's very slow. result = [] for fline in flines:     result.append(fline) resultStr = ''.join(result)   # if you want to join string with new lines use following code # resultStr = os.linesep.join(result)