python config_error ai_generated true

sqlalchemy.exc.ArgumentError: Could not parse rfc1738 URL from string 'postgresql://user:pass@localhost:5432/db'

ID: python/sqlalchemy-invalid-database-url

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2025-04-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

The database URL is malformed, often due to special characters in the password not being URL-encoded.

generic

中文

数据库 URL 格式错误，通常是由于密码中的特殊字符未进行 URL 编码。

Workarounds

  1. 98% success URL-encode the password 
    from urllib.parse import quote_plus
password = 'p@ssword!'
encoded_password = quote_plus(password)
url = f'postgresql://user:{encoded_password}@localhost:5432/db'
  2. 90% success Use a config file with properly escaped strings 
    # In config file:
DATABASE_URL=postgresql://user:p%40ssword%21@localhost:5432/db

Dead Ends

Common approaches that don't work:

  1. Removing special characters from the password 70% fail

    This changes the credentials and may break authentication.

  2. Using single quotes around the URL 80% fail

    The URL is still invalid; the issue is with encoding.