join函数需要提前定义么
ten_things="Apples Oranges Crows Telephone Light Sugar"print("Wait there's not 10 things in that list,let's fix that.")
stuff=ten_things.split()
more_stuff=["Day","Night","Song","Frisbee","Corn","Banana","Girl","Boy"]
while len(stuff)!=10:
next_one=more_stuff.pop()
print("Adding:",next_one)
stuff.append(next_one)
print("There is %d items now."%len(stuff))
print("There we go:",stuff)
print("Let's do some things with stuff.")
print(stuff)
print(stuff[-1])#whoa!fancy
print(stuff.pop())
print(' '.join(stuff))#what?cool! #
print()
print(' # '.join(stuff))#super stellar!
上面这段代码是一个练习，习题后面解释了这两种方式
①print(join(' ',stuff))，②print(' '.join(stuff))
①的意思是打印”用‘ ’连接things“
②的意思是”为‘ ’ 和things“调用join函数
在我的这段代码里，为什么②可以执行，而①报错，join函数需要我提前定义么？②的这种写法也不是很理解
哪个习题，他说的（1）就是错的 如果你非要提前定义……
join = str.join
这行代码放在最开头 歌者文明清理员 发表于 2023-6-13 23:29
如果你非要提前定义……
这行代码放在最开头
那②这种做法怎么理解呢 pionrrt 发表于 2023-6-13 23:41
那②这种做法怎么理解呢
a.join(b)
# b是列表
用a来拼接b
比如：b=['b0','b1','b2']
a=" "#空格
a.join(b)#b0 b1 b2
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