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dict = {1: 'a', 2: 'b'}
value = 'a'
key = [x for x in dict.keys() if dict[x] == value][0]
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d = {'key1': 'aaa', 'key2': 'aaa', 'key3': 'bbb'}
keys = [k for k, v in d.items() if v == 'aaa']
print(keys)
# ['key1', 'key2']
keys = [k for k, v in d.items() if v == 'bbb']
print(keys)
# ['key3']
keys = [k for k, v in d.items() if v == 'xxx']
print(keys)
# []
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myDict = {
"message": "Hello Grepper!"
}
for key, value in myDict.items():
print(key) #Output: message
print(value) #Output: Hello Grepper!
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# creating a new dictionary
my_dict ={"java":100, "python":112, "c":11}
# list out keys and values separately
key_list = list(my_dict.keys())
val_list = list(my_dict.values())
# print key with val 100
position = val_list.index(100)
print(key_list[position]
output: java
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dict = {'color': 'blue', 'shape': 'square', 'perimeter':20}
dict.get('shape') #returns square
#You can also set a return value in case key doesn't exist (default is None)
dict.get('volume', 'The key was not found') #returns 'The key was not found'
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myDict = {
"comment": "A like if you love learning python with grepper!"
}
myDict["comment"] #retrieves comment if found. Otherwise triggers error
#or if not sure if key is in dictionary, avoid exiting code with error.
myDict.get("comment") #retrieves comment or None if not found in dict
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print(d.get('key5', 'NO KEY'))
# NO KEY
print(d.get('key5', 100))
# 100
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myDict={"name":"PythonForBeginners","acronym":"PFB"}
print("Dictionary is:")
print(myDict)
dict_items=myDict.items()
print("Given value is:")
myValue="PFB"
print(myValue)
print("Associated Key is:")
for key,value in dict_items:
if value==myValue:
print(key)