PYTHON

python check if value exists in any key

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

python dictionary get value if key exists

val = dict.get(key , defVal)  # defVal is a default value if key does not exist 

find if value exists in dictionary python

# python check if value exist in dict using "in" & values()
if value in word_freq.values():
    print(f"Yes, Value: '{value}' exists in dictionary")
else:
    print(f"No, Value: '{value}' does not exists in dictionary")

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")

python check if key exist in dict

# in tests for the existence of a key in a dict:

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

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

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

# Use dict.get() to provide a default value when the key does not exist:
d = {}

for i in range(10):
    d[i] = d.get(i, 0) + 1

# To provide a default value for every key, either use dict.setdefault() on each assignment:
d = {}

for i in range(10):
    d[i] = d.setdefault(i, 0) + 1

# or use defaultdict from the collections module:
from collections import defaultdict

d = defaultdict(int)

for i in range(10):
    d[i] += 1