Equivalent of PHP Isset in Python

In PHP, the isset() function is used to check if a variable is set and is not null. In Python, there isn’t a direct equivalent, but you can achieve similar functionality by using conditional checks or the .get() method for dictionaries.

Here’s how you can replicate the behavior of isset() in Python:

Example: Checking for Key Existence with .get()
When working with dictionaries, Python’s .get() method allows you to access a key safely without raising a KeyError if the key is missing. If the key doesn’t exist, .get() returns None by default, or a specified value.

result = {
   'GetOdds': [{
       'result': None
   }]
}

# Using .get() to avoid KeyError and check for None
if result.get('GetOdds') and result['GetOdds'][0].get('result') is not None:
   print("Valid result")
else:
   print("Result is missing or None")

Explanation:

1. Checking for Key Existence: In the example above, .get(‘GetOdds’) checks if the key ‘GetOdds’ exists in the dictionary. This prevents a KeyError in case the key is missing.
2. Checking for None: After confirming that ‘GetOdds’ exists, the next check ensures that the ‘result’ inside the dictionary is not None.

By combining .get() and explicit checks for None, this method mimics PHP’s isset() by allowing you to check both the existence of a key and its value safely.