check whether key is in dictionary python code example

Example 1: check if is dictionary

isinstance(df, pd.DataFrame)
isinstance(df, dict)
isinstance(df, list)

Example 2: 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")