解压序列赋值给多个变量
'''使用无关变量,如_或者ign'''
data = ['ACME', 50, 91.1, (2017, 2, 27)]
_, shares, price, _ = data
print(shares)
print(price)
'''
50
91.1
'''
''' 使用*号 '''
record = ('Dave', 'dave@example.com', '110', '120')
name, email, *phone_numbers = record
print(name)
print(email)
print(phone_numbers)
'''
'Dave'
'dave@example.com'
['110', '120']
'''
sales_record = [1, 2, 3, 4, 5, 6, 7]
*trailing_qtrs, current_qtr = sales_record
trailing_avg = sum(trailing_qtrs) / len(trailing_qtrs)
print(trailing_avg)
'''
>>>3.5
'''
'''星号表达式迭代可变长元组'''
records = [
('foo', 1, 2),
('bar', 'hello'),
('foo', 3, 4)
]
for tag, *args in records:
print(args)
'''
[1, 2]
['hello']
[3, 4]
'''
'''字符串操作'''
line = 'nobody:*:-2:-2:Unprivileged User:/var/empty:/user/bin/false'
uname, *fields, homedir, sh = line.split(':')
print(uname)
print(fields)
print(homedir)
print(sh)
'''
nobody
['*', '-2', '-2', 'Unprivileged User']
/var/empty
/user/bin/false
'''
record = ('ACME', 50, 123.45, (12, 18, 2015))
name, *_, (*_, year) = record
print(name)
print(year)
'''
ACME
2015
'''
'''使用这样的分割语法实现递归'''
items = [1, 2, 3, 4, 5, 6, 7]
def my_sum(items):
head, *tail = items
return head + sum(tail) if tail else head
print(my_sum(items))
'''
>>>28
'''
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