template = '{l} {i} {s}, {y} {n} {p}'
l = 'Life'
i = 'is'
s = 'short'
y = 'you'
n = 'need'
p = 'Python'
result = template.format(l,i,s,y,n,p)
print(result)
result = template.format(l='Life',i='is',s='short',y='you',n='need',p='Python')
print(result)
>>> a='python'
>>> print('hello,',a or 'world')
hello, python
解释：短路运算 a or 'world'，a为True结果一定为True，直接返回a
>>> b=''
>>> print('hello,',b or 'world')
hello, world
解释：python讲空字符串看作False，b or 'world'，b为False，结果取决于'world'，直接返回‘world’
def func(x):
if isinstance(x, list):
sum = 0
for item in x:
sum += item
return sum
elif isinstance(x, tuple):
sum = 1
for item in x:
sum *= item
return sum
L = [1, 2, 3,4]
t = tuple(L)
print(func(L),func(t))
