#coding=utf-8 txtName = "codingWord.txt" f=file(txtName, "a+") for i in range(1,100):     if i % 2 == 0:         new_context = "C++" + '\n'         f.write(new_context)     else:         new_context = "Python" + '\n'         f.write(new_context) f.close() 实际应用，合并libsvm所需要格式的两个txt特征值 方法1： #coding=utf-8 import numpy as np import os cwd = os.getcwd() txtFile1 = cwd + '/first.txt' txtFile2 = cwd + '/second.txt' mergeFile2 = cwd + '/mergeTXT.txt' f = file(mergeFile2, 'a+') for (index1, line1) in enumerate(open(txtFile1)):     # print index1, line1     for (index2, line2) in enumerate(open(txtFile2)):         if index1 == index2:             newline = line1 + line2 + '\n'             f.write(newline) f.close()

方法2： first=[] second=[] f=open('mergeTXT.txt','w') with open('first.txt', 'r') as f1:     for line in f1:         line=line.strip()         first.append(line) with open('second.txt', 'r') as f2:     for line2 in f2:         line2=line2.strip()         second.append(line2) for i in range(0,399):     result=first[i]+'\t'+second[i]+'\n'     f.write(result)