How to test if a dictionary contains a specific key?
15235
Check if a given key already exists in a dictionary
40229
How do I check if a variable exists?
51956
Sort a Dictionary by key AND value?
120682
How do I verify that a string only contains letters, numbers, underscores and dashes?
61752
What's the difference between isset() and array_key_exists()?
58316
Dictionary KeyNotFoundException even though Key exists
14661
How can I check if a Perl array contains a particular value?
118108
Check if a Python list item contains a string inside another string
133675
EntityFramework - contains query of composite key
83047
Implementing a dictionary data structure
41460
`if key in dict` vs. `try/except` - which is more readable idiom?
146624
return key by value in dictionary
134748
Determine whether an array contains a value
150989
deleting entries in a dictionary based on a condition
117386
Test if player has specific item in specific hotbar slot [1.8]
104353
HashMap Search for part of an key?
64643
Pythonic way of checking if a condition holds for any element of a list