Python 3 urllib produces TypeError POST data should be bytes or an iterable of bytes It cannot be of
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Title: Resolving TypeError in Python 3 urllib: POST data should be bytes or an iterable of bytes
Introduction:
When working with Python 3 and the urllib library to perform HTTP requests, you might encounter a TypeError related to POST data. The error message typically looks like this: "TypeError: POST data should be bytes or an iterable of bytes. It cannot be of type str." This issue arises when you attempt to send string data as the POST payload, but urllib expects the data to be in bytes or an iterable of bytes.
In this tutorial, we'll explore the cause of this error and provide a step-by-step guide on how to resolve it.
Error Scenario:
Error Message:
Cause:
The error occurs because the data parameter in the urlopen function expects bytes or an iterable of bytes, but urlencode returns a string. To resolve this, we need to encode the string data into bytes before sending the POST request.
Solution:
Modify the code to encode the data into bytes using the encode method. Here's an updated version of the code:
Explanation:
By following this solution, you should be able to resolve the TypeError and successfully make a POST request using Python 3 urllib.
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