check if a key exists in a dictionary python code example

Example 1: python check if key exists

# You can use 'in' on a dictionary to check if a key exists
d = {"key1": 10, "key2": 23}
"key1" in d
# Output:
# True

Example 2: how to know if a key is in a dictionary python

dict = {"key1": 1, "key2": 2}

if "key1" in dict:

Example 3: python check if value exists in any key

>>> d = {'1': 'one', '3': 'three', '2': 'two', '5': 'five', '4': 'four'}
>>> 'one' in d.values()
True

Example 4: how to check if a key is present in python dictionary

dict = { "How":1,"you":2,"like":3,"this":4}
key = "this"
if key in dict.keys():
    print("present")
    print("value =",dict[key])
else:
    print("Not present")

Example 5: python check if key exists

d = {"apples": 1, "banannas": 4}
# Preferably use .keys() when searching for a key
if "apples" in d.keys():
  print(d["apples"])

Example 6: check if a key exists in a dictionary python

d = {"key1": 10, "key2": 23}

if "key1" in d:
    print("this will execute")

if "nonexistent key" in d:
    print("this will not")