06. enumerate()函數和推導式生成列表--操作每行增加行號

'''
開1,心就好,哈哈哈哈哈 #1
你可以知道嗎,我不知道 #2
哈哈哈,1234567      #3
'''
#給文件e.txt加行號
# a = ["I love you!\n","開心就好\n","加油吧,少年\n"]
# b = enumerate(a)
# print(list(b)) #[(0, 'I love you!'), (1, '開心就好\n'), (2, '加油吧,少年\n')]
# print(a)
# c = [temp.rstrip()+" #"+str(index) for index,temp in enumerate(a)] #rstrip()去空行符
# print(c)
with open("e.txt","r",encoding="utf-8") as f:
    lines = f.readlines()
    lines = [temp.rstrip()+" #"+str(index)+"\n" for index,temp in enumerate(lines)] #推導式生成列表

with open("e.txt","w",encoding="utf-8") as f:
    f.writelines(lines)

輸出:

開1,心就好,哈哈哈哈哈 #0
你可以知道嗎,我不知道 #1
哈哈哈,1234567 #2