How can I search for a specific key in a dictionary in Python?-CodePudding

So I got this dictionary from a csv file and I would like to look for a specific key inside this dictionary (actually the og idea was to search for said key in the csv file and then make a dictionary from that key down) but I don't really know how to do it.

So far I got:

    df = pd.read_csv('data.csv')
    dict = df.to_dict(orient='dict')
    for index, line in enumerate(dict):
        if "Wavelength [nm]" in line:
         print(index)

The idea is to know the index of "Wavelength".

CodePudding user response：

you can use:

if key in dict:
    print(key,dict[key])

CodePudding user response：

If you want the value of a key without knowing whether it's in the dict, often the most natural way is

value = dict.get( key, defaultvalue)

defaultvalue is what you would set value to in your code once you had established that the key is not present. Often, None, or an empty list or tuple.

If you just waht to check whether the key is present without accessing the value, use

if key in dict:
    # do stuff