split():
split() 方法根据分隔符将字符串划分为子字符串列表。
加入():
join() 方法使用调用它的字符串作为分隔符，将可迭代的元素连接成单个字符串。
使用循环的示例：
s = "today is thursday"
reverse = ""
i = 0
while i<len(s):
reverse = reverse + s[-(i+1)]
i+=1
print(reverse)
i = 0
word = ""
while i<len(reverse):
if reverse[i]==' ':
print(word[::-1],end=' ')
word = ""
i+=1
continue
word = word + reverse[i]
i+=1
else:
print(word[::-1])
yadsruht si yadot thursday is today
使用列表的示例：
sen = "today is thursday"
l = sen.split(" ")
print(l)
print(l[::-1])
s = " ".join(l[::-1])
print(s)
['today', 'is', 'thursday'] ['thursday', 'is', 'today'] thursday is today
深拷贝：
Python 中的深拷贝是指创建一个新对象，该对象是原始对象的完全独立副本，包括嵌套在其中的所有对象。
l1 = [10,20,30] l2 = l1 print(l1) print(id(l1)) print(l2) print(id(l2)) l2[0] = 111 print(l1) print(l2)
[10, 20, 30] 127285488814912 [10, 20, 30] 127285488814912 [111, 20, 30] [111, 20, 30]
浅复制：
浅拷贝，其中新对象是原始对象的副本，但它包含对相同嵌套对象的引用。
l1 = [10,20,30] l2 = l1.copy() print(l1) print(id(l1)) print(l2) print(id(l2)) l2[0] = 111 print(l1) print(l2)
[10, 20, 30] 140500496468800 [10, 20, 30] 140500496470528 [10, 20, 30] [111, 20, 30]
字典顺序：
词典顺序是单词在词典中按字母顺序排序的方式的概括。
l1 = ['lakshmi', 'guru', 'kuhan'] l2 = ['lakshmi', 'guru', 'kuhan'] print(l1 == l2) print(l1 != l2) l2 = ['guru', 'lakshmi', 'kuhan'] print(l1>l2) print(l1<l2)
True False True False
示例：
l1 = [10,20,30]
l2 = [5,6,7]
for no in l1:
for num in l2:
print(no, num, end=' ')
print()
10 5 10 6 10 7 20 5 20 6 20 7 30 5 30 6 30 7
如果输出附近有 20 20，则删除：
l1 = [10,20,30]
l2 = [8,20,7]
for no in l1:
for num in l2:
if no==num:
print(" ", end=" ")
else:
print(no, num, end=' ')
print()
10 8 10 20 10 7 20 8 20 7 30 8 30 20 30 7
任务：
查找给定总和的对：5
l = [1,2,3,4,5,6,7,8,9,0]
for i in range(len(l)):
for j in range(len(l)):
sum = l[i] + l[j]
if sum == 5:
print(l[i], l[j])
1 4 2 3 3 2 4 1 5 0 0 5
找到丢失的号码：
l = [10,20,30,50,60,70,80,90]
i=0
while i<len(l)-1:
if l[i+1]-l[i]!=10:
result=(l[i]+l[i+1])/2
print(int(result))
i+=1
40
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