1. collections.namedtuple
namedtuples를 사용하면 index 대신 필드 이름으로 접근할 수 있다.
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# 'employees' 테이블
# 컬럼: name, manager, salary
def print_employee_info(db_connection):
db_cursor = db_connection.cursor()
results = db_cursor.excute('select * from eployees').fetchall()
for row in results:
print(row[0] + 's manager is ' + row[1])
index로 접근
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# 'employees' 테이블
# 컬럼: name, manager, salary
from collections import namedtuple
EmployeeRow = namedtuple('EmployeeRow', ['name', 'manater', 'salary'])
EMPLOYEE_INFO = '{name}"s manager is {manager}'
def print_employee_info(db_connection):
db_cursor = db_connection.cursor()
results = db_cursor.excute('select * from eployees').fetchall()
for row in results:
employee = EmployeeRow._make(row)
print(EMPLOYEE_INFO.format(**employee._asdict))
2. 필요하지 않은 데이터는 _ 로 대체
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(age, temp) = get_user_info(user)
if age > 21:
print('over 21')
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(age, _) = get_user_info(user)
if age > 21:
print('over 21')
3. unpack
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l = ['dog', 'Fido']
animal = l[0]
print(animal)
dog
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l = ['dog', 'Fido']
(animal, name) = l
print(animal)
dog
4. 함수에서 여러 값을 리턴할 때 사용
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def calculate_min(value_list):
return min(value_list)
def calculate_max(value_list):
return max(value_list)
values = [10, 20]
min_value = calculate_min(values)
max_value = calculate_max(values)
print(min_value)
10
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def calculate(value_list):
min_value = min(value_list)
max_value = max(value_list)
return min_value, max_value
values = [10, 20]
(min_value, max_value) = calculate(values)
print(min_value)
10
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