执行Python3 Webhook.py触发<fstring>语法错误的排查求助

First, let's get to the root of this issue: the error message File "<fstring>", line 1 (%X - %x) doesn't mean line 1 of your physical file is broken—it points to a formatted string literal (f-string) somewhere in your code that incorrectly mixes two incompatible string formatting styles.

Why this error pops up #

Python 3.6+ introduced f-strings, which use {expression} syntax to insert values into strings. However, you can’t mix this with the older %-based formatting (like %X or %x) inside an f-string. For example, a line like this will throw exactly the error you’re seeing:

# ❌ Wrong: Mixes f-string and % formatting
time_output = f"%X - %x"

Step-by-step fixes #

1. Hunt for all f-strings in your code: Search every instance of f" or F" in Webhook.py. The <fstring> in the error refers to the string itself, not the physical line number of your script—so ignore line 1 and focus on these f-string declarations.
2. Fix the mixed syntax: Convert the % placeholders to valid f-string expressions. If you’re trying to format a timestamp, for example, rewrite the line to use strftime inside curly braces:

   # ✅ Correct: Uses f-string with valid expressions
   import time
   time_output = f"{time.strftime('%X')} - {time.strftime('%x')}"
   

   Alternatively, if you prefer the older % style, drop the f-string entirely:

   # ✅ Correct: Uses only % formatting
   time_output = "%X - %x" % ()
   

3. Check for hidden f-strings: Sometimes f-strings are embedded in function calls (like print(f"...")) or split across lines—scan your entire script to make sure you don’t miss any.

Why your previous attempts didn’t work #

• Upgrading to Python 3.6.5 didn’t help because all Python 3.6+ versions enforce the same f-string rules—this isn’t a version-specific bug.
• Importing libraries like time, os, or aiohttp works fine because the problem lives in your string formatting logic, not in library dependencies.

内容的提问来源于stack exchange，提问作者incredaboy