How to Comment Multiple Lines in Jupyter Notebook

In order to comment on multiple lines at once in Jupyter Notebook, you have to select the required lines and then press the Ctrl + / .

For example:

df = pd.DataFrame()

for file in os.listdir("SampleData"):
    if file.endswith(".csv"):
        tmp = pd.read_csv(os.path.join("SampleData", file))
        df = pd.concat([df,tmp], ignore_index = True)

df.drop_duplicates(inplace= True)

Then we select all the rows and press the Ctrl and / and voilà!

# df = pd.DataFrame()

# for file in os.listdir("SampleData"):
#     if file.endswith(".csv"):
#         tmp = pd.read_csv(os.path.join("SampleData", file))
#         df = pd.concat([df,tmp], ignore_index = True)

# df.drop_duplicates(inplace= True)

Similarly, by pressing again the Ctrl and / we uncomment the code!