str' object has no attribute 'readline'
时间: 2023-08-02 20:07:41 浏览: 101
这个错误提示意味着你尝试在一个字符串对象上调用 `readline` 方法,但是字符串对象并没有这个方法。`readline` 方法通常用于文件对象来逐行读取文件内容。请确保你正在操作的是一个文件对象而不是一个字符串对象。如果你想逐行读取一个字符串,你可以使用 `splitlines()` 方法将字符串按行分割成一个列表,然后逐行处理。例如:
```python
string = "Line 1\nLine 2\nLine 3"
lines = string.splitlines()
for line in lines:
print(line)
```
这将输出:
```
Line 1
Line 2
Line 3
```
相关问题
str object has no attribute decode
"AttributeError: 'str' object has no attribute 'decode'"错误通常发生在我们试图对字符串对象使用"decode"方法时。这是因为在Python 3中,字符串对象已经不再有"decode"方法,而是用于将字节对象解码为字符串的方法。因此,当我们尝试对字符串对象使用"decode"方法时,会出现该错误。
要解决这个错误,您可以按照以下步骤进行操作:
1. 确保您的代码中没有对字符串对象使用"decode"方法。您可以检查是否在字符串对象上调用了"decode"方法,若有,请将其删除或替换为适当的方法。
2. 如果您确实需要对字节对象进行解码操作,请确保您正在操作的是字节对象而不是字符串对象。您可以使用"encode"方法将字符串编码为字节对象,然后再使用适当的解码方法对其进行解码。
str object has no attribute setex
The error message "str object has no attribute setex" means that you're trying to call the setex method on a string object, but this method is not defined for strings.
The setex method is a Redis command that sets a value in a Redis database with an expiration time. To use this method in Python, you need to first connect to a Redis server using a Redis client library such as redis-py, and then call the setex method on the Redis client object.
Here's an example of how to use the setex method with redis-py:
```python
import redis
r = redis.Redis(host='localhost', port=6379, db=0)
r.setex('mykey', 60, 'myvalue')
```
This code connects to a Redis server running on localhost:6379, selects database 0, and then sets the key 'mykey' with the value 'myvalue' and an expiration time of 60 seconds.
Make sure you have installed redis-py library before running this code.