从0开始学python：简单的练习题4

不要em0啦2026-01-03 16:15

python 复制代码

studentage=[21,25,21,23,22,20]
studentage.append(31)
studentage.extend([29,33,30])
num1=studentage[0]
print(num1)
num2=studentage[-1]
print(num2)
find=studentage.index(31)
print(find)

while循环代码

python 复制代码

list1=[1,2,3,4,5,6,7,8,9,10]
list2=[]
x=0
while x <len(list1):
    if list1[x]%2==0:
        list2.append(list1[x])
    x+=1
print(list2)

for循环代码

python 复制代码

list1=[1,2,3,4,5,6,7,8,9,10]
list2=[]
for x in list1:
    if x%2==0:
        list2.append(x)
print(list2)

python 复制代码

char="万过薪月，员序程马黑来，nohtyp学"
"""
取出字符串倒序
"""
char1=char[::-1]
char2=char1[9:14]
print(char2)
"""
split分割，再replace，再倒叙
"""
char3=char.split("，")
char3=char3[1]
char3=str(char3)
char3=char3.replace("来","")
char3=char3[::-1]
print(char3)

python 复制代码

my_list=['黑马程序员','传播智客','黑马程序员','传播智客','itheima','itcast','itheima','itcast','best']
emptylist=set()
x=0
while x<len((my_list)):
    emptylist.add(my_list[x])
    x+=1
print(emptylist)