Python Evaluation in text like Django Templates

examples.txt

### Example 1:
>>> format_eval("Hello {{ 'world'.upper() }}")
'Hello WORLD'

### Example 2:
>>> import requests
>>> format_eval("Request to Google: Code {{ requests.get('https://google.com').status_code) }}")
'Request to Google: Code SyntaxError'
>>> format_eval("Request to Google: Code {{ requests.get('https://google.com').status_code }}")
'Request to Google: Code 200'

### Example 3:
>>> print(format_eval("""Your Username: {{ (username := 'MohammadHosseinGhorbani') }}
... Is Valid: {{ not username.startswith('_') }}"""))
Your Username: MohammadHosseinGhorbani
Is Valid: True

main.py

def format_eval(text: str):
    while '{{' in text and '}}' in text:
        start = text.index('{{')
        end = text.index('}}')
        try:
            text = text.replace(text[start:end+2], str(eval(text[start+2:end])))
        except Exception as e:
            text = text.replace(text[start:end+2], repr(type(e)())[:-2])
    return text