Exercise 1:
Enter any string from the keyboard and separate the characters in the string according to the following requirements:
1. Take out the even-numbered elements of the string respectively (note: the position of the string is determined by counting from left to right)
2 , and store them in a list in turn;
3. Output this list.
Answer:
n=input('请输入任意字符串:') #创建变量n存放用户输入内容
list1=[] #创建变量list1为空列表
for i in range(len(n)): #len()获取字符串长度 使用range()函数配合for进行循环
if i %2==0: #判断是否为第偶数位的元素
list1.append(n[i]) #符合条件的 使用append函数插入空列表list1
else: #for循环结束
print(list1) #打印出list1 列表
Exercise 2:
Write a program to help teachers classify English letters, numbers and other characters (note: including spaces) in English test papers and count the number of each character.
Input sample:
* Welcome to 2023~!
Output sample:
Letters: Welcometo, 9 in total
Numbers: 2023, 4 in total
Other characters: ~! 6 in total
Answer:
str1=input('请输入任意字符串:') #创建变量str1存放用户输入内容
#str1='**Welcome to 2023~!' #创建变量str1存放字符串 **Welcome to 2023~!
z='' #创建变量z存放字母字符串 初始化为空
s='' #创建变量s存放数字字符串 初始化为空
q='' #创建变量q存放其他字符串 初始化为空
for i in str1: #使用for循环 遍历str1字符串每一项目
if 65<=ord(i)<=90 or 97<=ord(i)<=122: #根据下图ASCII码 发现字母从A~Z的ASCII值65~90之间 a~z的ASCII值97~122之间
z+=i #符合条件的添加到字符串z里面
elif ord(i)>=48 and ord(i)<=57: #根据下图ASCII码 发现字母从0~9的ASCII值48~57之间
s+=i #符合条件的添加到字符串s里面
else: #排除以上情况
q+=i #符合条件的添加到字符串q里面
print('字母: %s,共%d个'% (z,len(z)))
print('数字: %s,共%d个'% (s,len(s)))
print('其它字符: %s,共%d个'% (q,len(q)))
ASCII comparison table
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