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python - 如何删除字符串的初始空格？

问题描述

我尝试读取一个文件，然后生成一个恒温的新文件。

我尝试阅读的文件中的示例。

0.000000  353.132629
10.000000  348.849274
20.000000  345.484161
30.000000  340.822479
40.000000  340.704346
50.000000  344.139404
60.000000  344.501953
70.000000  344.187286
80.000000  348.505554
90.000000  346.961700

然后我尝试生成的新文件

0.000000  343
10.000000  343
20.000000  343
30.000000  343
40.000000  343
50.000000  343
60.000000  343
70.000000  343
80.000000  343
90.000000  343

我无法解决的问题是如何只从我读取的文件中删除第一个空格。

在我的代码中，我将数字数据分成两列，但是因为程序获得了起始空间ValueError。那么如何改进我的代码并摆脱我的问题呢？

我的python代码：

import sys
import os
import getopt

#function for replacing volumes over temperatures

def convert_to_volume_file(inputfile, outputfile, volume):      
    try:
        file1 = open(inputfile, "r")    #read input file
        file2 = open(outputfile, "w+")  #write new file for output
        line = file1.readline() 
        while line != "":
            if line[0] == '#': 
                file2.write(line)
            elif line[0] == '@' and line[2] == 's':
                file2.write('@ s0 legend "Volume"\n')   #replace 'legend' for volume
            elif line[0] == '@':
                file2.write(line)       
            else:           
                line.replace(" ", "")               
                num = line.split(" ")           #split data to 2 columns
                num[1] = volume             #overwriting volume to appropriate place
                file2.write("%.6f %.4f\n"%(float(num[0]), float(num[1])))   
            line = file1.readline() 
        file1.close()
        file2.close()
    except OSError:
        print("ERROR")

#main function that reads user inputs from command line 

def main(argv):
    inputfile = ''
    outputfile = ''
    try:
        opts, args = getopt.getopt(argv,"f:o:v:")
    except getopt.GetoptError:
        print("INPUT ERROR!!! Input form: -f <inputfile> -o <outputfile> -v <volume>")
        return  
    for opt, arg in opts:   
        if opt in ("-f"):       #input
            inputfile = arg
        elif opt in ("-o"):     #output
            outputfile = arg
        elif opt in ("-v"):     #volume of simulation box
            volume = float(arg)
    convert_to_volume_file(inputfile, outputfile, volume)
main(sys.argv[1:])

标签： pythonpython-3.x

解决方案

您可以使用strip、lstrip和rstrip方法分别从字符串的两端、左侧和右侧删除尾随空格。

line = line.strip() #removes trailing spaces from both ends of the string
line = line.lstrip() #removes trailing spaces from the left end of the string
line = line.rstrip() #removes trailing spaces from the right end of the string

我希望我已经过度简化了:)

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