python_pandas_11 - 8BitsCoding/RobotMentor GitHub Wiki

• 유투부

data_list = [{'yyyy-mm-dd': '2000-06-27'},
            {'yyyy-mm-dd': '2002-09-24'},
            {'yyyy-mm-dd': '2005-12-20'}]

df = pd.DataFrame(data_list, columns = ['yyyy-mm-dd'])

def extract_year(column):
    return column.split("-")[0]

df['year'] = df['yyyy-mm-dd'].apply(extract_year)

def get_age(year, current_year):
    return current_year - int(year)

df['age'] = df['year'].apply(get_age, current_year=2018)

매개변수 넣기

def get_introduce(age, prefix, suffix):
    return prefix + str(age) + suffix

df['introduce'] = df['age'].apply(get_introduce, prefix="I am", suffix" years old")

여러개의 매개변수 넣기 - 1

def get_introduce2(row):
    return "I was born in " + str(row.year) + " my age is " + str(row.age)

df.introduce = df.apply(get_introduce2, axis = 1)

여러개의 매개변수 넣기 - 2