[Solved] Python – Put new line into file at largest indent

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You may want a code something like –

start = 1
lines = ['Step' + str(start) + ':\n']
with open('file.txt','r') as inF:
    prevspace = -1
    for line in inF:
        lspaces = len(line) - len(line.lstrip())
        if lspaces > prevspace and prevspace != -1:
            lines.append('Step' + str(start+1) + ':\n')
            start = start + 1
            lines.append(line)
            prevspace = lspaces
        else:
            lines.append(line)
            prevspace = lspaces
    ifF.close()

with open('newfile.txt','w') as outF:
    for line in lines:
        outF.write(line)
    outF.flush()
    outF.close()

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solved Python – Put new line into file at largest indent