标签：readline with code 方法 txt new 文件 close readlines
往文件中所有添加指定的前缀
方法一：open方法
f_r = open(‘text.txt‘) f_w = open(‘text_new.txt‘,‘w+‘) i = 0 while True: i += 1 line = f_r.readline() if not line: break f_w.write(‘%02d‘%i + ‘.python‘+ ‘ ‘ +line) f_r.close() f_w.close() f_wr = open(‘text_new.txt‘,‘r‘) lines = f_wr.readlines() for i in lines: print(i) f_wr.close()
with open(‘text.txt‘) as f_r:
line = f_r.readline()
with open(‘text_new.txt‘,‘w‘) as f_w:
i = 0
while True:
i += 1
line = f_r.readline()
if not line:
break
# f_w.write(‘%02d‘%i + ‘.python‘+ ‘ ‘len+line) #格式化输出方法一
f_w.write(‘{:>2}{}{}{}‘.format(i,‘.python‘,‘ ‘,line)) #格式化输出方法二
with open(‘text_new.txt‘,‘r‘) as f_wr:
lines = f_wr.readlines()
for i in lines:
print(i)
执行结果：
01.python jave 02.python go 03.python shell 04.python perl
python练习六十二：文件处理，往文件中所有添加指定的前缀
标签：readline with code 方法 txt new 文件 close readlines
原文地址：https://www.cnblogs.com/pinpin/p/10299903.html
