CODEWITHSUNDEEP
pythonpandas
user12393685
user12393685

Reputation:

Why Pandas apply function returns None

I try to replace a character in some strings with conditions in a pandas dataframe column. The function works but the rows of the dataframe display None.

def char_replace(string):
    if string.startswith(tuple(list)):
        return string.replace("_", "-", 1)

df["col1"] = df["col1"].apply(char_replace)

Upvotes: 2

Views: 780

Answers (2)

EMiller
EMiller

Reputation: 837

You don't even need an else statement. If the condition is not met, the function will proceed to the second return statement.

def char_replace(string):
    if string.startswith(tuple(list)):
        return string.replace("_", "-", 1)
    return string
df["col1"] = df["col1"].apply(char_replace)

Upvotes: 1

Shantanu singh
Shantanu singh

Reputation: 82

  def char_replace(string):
    if string.startswith(tuple(list)):
        return string.replace("_", "-", 1)
    else:
         return string

df["col1"] = df["col1"].apply(char_replace)

need to have an option if string does not start with that paticular value

Upvotes: 0

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