IndentationError:意外的unindent为什么?

时间:2012-04-20 03:00:45

标签: python indentation

IndentationError:意外的unindent为什么???

#!/usr/bin/python
import sys
class Seq:
    def __init__(self, id, adnseq, colen):
        self.id     = id
        self.dna    = adnseq
        self.cdnlen = colen
        self.prot   = ""
    def __str__(self):
        return ">%s\n%s\n" % (self.id, self.prot)
    def translate(self, transtable):
        self.prot = ""
        for i in range(0,len(self.dna),self.cdnlen):
            codon = self.dna[i:i+self.cdnlen]
            aa    = transtable[codon]
            self.prot += aa
    def parseCommandOptions(cmdargs):
        tfname = cmdargs[1]
        sfname = cmdargs[2]
        return (tfname, sfname)
    def readTTable(fname):
        try:
            ttable = {}
            cdnlen = -1
            tfile = open(fname, "r")
            for line in tfile:
                linearr = line.split()
                codon   = linearr[0]
                cdnlen  = len(codon)
                aa      = linearr[1]
                ttable[codon] = aa
            tfile.close()
            return (ttable, cdnlen)
    def translateSData(sfname, cdnlen, ttable):
        try: 
            sequences = []
            seqf = open(seq_fname, "r")
            line = seqf.readline()
            while line:
                if line[0] == ">":
                    id = line[1:len(line)].strip()
                    seq = ""
                    line = seqf.readline()
                    while line and line[0] != '>':
                        seq += line.strip()
                        line = seqf.readline()  
                    sequence = Seq(id, seq, cdnlen)
                    sequence.translate(ttable)
                    sequences.append(sequence)
            seqf.close()
            return sequences    
    if __name__ == "__main__":
        (trans_table_fname, seq_fname) = parseCommandOptions(sys.argv)
        (transtable, colen) = readTTable(trans_table_fname)
        seqs = translateSData(seq_fname, colen, transtable)
        for s in seqs:
            print s

它说:

 def translateSeqData(sfname, cdnlen, ttable):
   ^
IndentationError: unexpected unindent

为什么?我检查了几千次,我找不到问题。我只使用Tabs而没有空格。另外,有时它要求定义类。那好吗?

4 个答案:

答案 0 :(得分:61)

因为你有:

def readTTable(fname):
    try:

except块之后没有匹配的try:块。每个try必须至少有一个匹配except

请参阅Python教程的Errors and Exceptions部分。

答案 1 :(得分:1)

您没有完成try声明。你也需要except

答案 2 :(得分:0)

此错误实际上可能位于报告错误之前的代码中。请参阅例如,如果您有如下语法错误,您将收到缩进错误。语法错误实际上在“except”旁边,因为它应该在它之后包含“:”。

try:
    #do something
except
    print 'error/exception'


def printError(e):
    print e

如果您将上面的“除外”更改为“except:”,则错误将消失。

祝你好运。

答案 3 :(得分:0)

@MaxPython上面的答案缺少“:”

try:
   #do something
except:
  # print 'error/exception'

def printError(e): 打印e