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pip install -r requirements.txt
{
    // ...

    "children": [
    {
      "Python都能做什么": {
        "keywords": [],
        "children": [],
        "node_id": "python-4-0"
      }
    },
    {
      "python起源和发展": {
        "keywords": [],
        "children": [],
        "node_id": "python-insert-2"
      }
    },
    {
      "python语言特点": {
        "keywords": [],
        "children": [],
        "node_id": "python-insert-3"
      }
    }
  ],
}
{
    // ...
    "export": [
        "helloworld.json"
        // ...
    ]
}
{
  "exercise_id": 33,
  "source": "helloworld.py",
  "depends": [],
  "multiline": [
    {
      "str1 = \"Hello,\"": "",
      "str2 = \"World!\"": "str = \"Hello,World!\"",
      "print('str1'+'str2')": "print(str)"
    },
    {
      "str1 = \"Hello,\"": "",
      "str2 = \"World!\"": "",
      "print('str1'+'str2')": "print(\"Hello\" +\",\" +\"World!\")"
    },
    {
      "print('str1'+'str2')": "print(str1+str2)"
    }
  ]
}
# -*- coding: UTF-8 -*-
# 作者：幻灰龙
# 标题：Hello World
# 描述：输出 "Hello,World!" 字符串，找出错的那项。

if __name__ == '__main__':
    str1 = "Hello,"
    str2 = "World!"
    print('str1'+'str2')

{
    "one_line": {
        "printf": ["print"],
        "return 0;": ["return 0"],
        "(\"Hello,Wrold!\")": [" \"Hello,Wrold!\""]
    }
}
// 变种代码1
#include <stdio.h>
int main(int argc, char** argv){
    print("Hello,Wrold!");
    return 0;
}
// 变种代码2
#include <stdio.h>
int main(int argc, char** argv){
    print("Hello,Wrold!");
    return 0
}
// 变种代码3
#include <stdio.h>
int main(int argc, char** argv){
    print "Hello,Wrold!";
    return 0
}
{
    "multiline": [
        {
            "printf": "print"
        },
        {
            "int main(int argc, char** argv){" : "int main(char** argv){",
            "return 0;" : "return 0",
        },
        {
            "#include <stdio.h>": ""
        }
    ]
}
// 变种代码1
#include <stdio.h>
int main(int argc, char** argv){
    print("Hello,Wrold!");
    return 0;
}
// 变种代码2, 注意第2组替换规则，包含了两行替换
#include <stdio.h>
int main(char** argv){
    print("Hello,Wrold!");
    return 0
}
// 变种代码3
int main(int argc, char** argv){
    print("Hello,Wrold!");
    return 0;
}
{
    "type": "code_options",
    "author": "幻灰龙",
    "source": "helloworld.md",
}
# Hello World

输出 "Hello,World!" 字符串，找出错的那项。

## template

```python
# this part is used to be displayed in jupyter notebook
if ___name__ == '__main__':
    str1 = "Hello,"
    str2 = "World!"
    print('str1' + 'str2')
```

## 答案

```python
if __name__ == '__main__':
    str1 = "Hello,"
    str2 = "World!"
    print('str1' + 'str2')
```

## 选项

### 两字符串变量拼接

```python
if __name__ == '__main__':
    str1 = "Hello,"
    str2 = "World!"
    print(str1+str2)
```

### 两字符串字面量拼接

```python
if __name__ == '__main__':
    print("Hello,"+"World!")
```

### 两字符串字面量拼接成字符串变量

```python
if __name__ == '__main__':
    str = "Hello," + "World!"
    print(str)
```