如何在一行python3中组合多个if语句

Question

嗨，我对python和编程很陌生，我将如何将它们结合起来：

if "Web" in source:
    source = "WEB"
if ((source == "Blu-ray") and (other == "Remux") and (reso == "1080p")):
    reso = "BD Remux"
if "DVD" in name:
    reso = "DVD Remux"
if ((source == "Ultra HD Blu-ray") and (other == "Remux") and (reso == "2160p")):
    reso = "UHD Remux"
if source == "Ultra HD Blu-ray":
    source = "Blu-ray"

Answer 1

您可以使用elif clause扩展带有额外条件的if语句：

mystring='what will it print?' 

if   mystring == 'hello':
     print('world!')
elif mystring == 'good':
     print('bye!')
elif mystring == 'how':
     print('are you?')
else:
     print('I ran out of ideas!')

 [out]: I ran out of ideas!

对您的示例稍加改写如下：

source='Ultra HD Blu-ray'
name='DVD'
reso='2160p'
other='Remux'

resos={'1080p':'BD Remux','2160p':'UHD Remux'}

if "Web" in source:
    source = "WEB"
elif "Blu-ray" in source and other == "Remux":
    source = "Blu-ray"
    reso   = resos.get(reso,'UNDEFINED')
elif "DVD" in name:
    reso = "DVD Remux"

print(source, name, reso)

[out]: Blu-ray DVD UHD Remux

请注意，我使用了resos字典来替换两个if标记，更详细地介绍了这个here。

Answer 2

将这么多的语句合并成一行(问题是一行吗？)可能不会是"Pythonic"。括号也是不必要的。

if "Web" in source:
    source = "WEB"
elif source == "Blu-ray" and other == "Remux" and reso == "1080p":
    reso = "BD Remux"
elif "DVD" in name:
    reso = "DVD Remux"
elif source == "Ultra HD Blu-ray" and other == "Remux" and reso == "2160p":
    reso = "UHD Remux"
elif source == "Ultra HD Blu-ray":
    source = "Blu-ray"
else:
    source = ""
          reso = ""