Question

我想在主题中包含文件名'main.txt'，因为我从命令行传递文件名。但这样做会出错

python sample.py main.txt #running python with argument 

msg['Subject'] = "Auto Hella Restart Report "sys.argv[1]  #line where i am using that passed argument

Answer 1

我猜你打算这样做：

msg['Subject'] = "Auto Hella Restart Report " + sys.argv[1]
# To concatenate strings in python, use       ^

Answer 2

试试

msg['Subject'] = "Auto Hella Restart Report " + sys.argv[1]

在python中重写+运算符以连接字符串。

Answer 3

如果您需要添加两个字符串，则必须使用“+”运算符

因此

msg['Subject'] = your string + sys.argv[1]

并且您还必须在开始时导入sys

as

import sys

msg['Subject'] = "Auto Hella Restart Report " + sys.argv[1]

Answer 4

variable=" Hello..."  
print (variable)  
print("This is the Test File "+variable)

表示整数类型...

variable="  10"  
print (variable)  
print("This is the Test File "+str(variable))

Answer 5

我知道这有点旧，但是我想添加一个更新的答案，其中包含f字符串，这是Python 3.6版中引入的：

msg['Subject'] = f'Auto Hella Restart Report {sys.argv[1]}'

Answer 6

使用python 3.6 +：

msg['Subject'] = f"Auto Hella Restart Report {sys.argv[1]}"

如何在Python中使用连接固定字符串和变量

6 个答案: