python day03 字符串操作

#bool  True False

#int ----> str
i = 1
s = str(i)
#str ---> int
s = '123'
i = int(s)

#int ----->bool 只要是0 ----》False 非0就是True
i = 3
b = bool(i)
print(b)
#bool----> int
#True 1
#False 0

'''
ps:
while True:
pass
while 1: 效率高
pass
'''

#str --->bool

#s = "" -----> False
#非空字符串都是True
#s = "0" -----> True

#字符串的索引与切片

s = 'ABCDLSESRF'
#索引
# s1 = s[0]
# print(s1)
# s2 = s[2]
# print(s2)
# s3 = s[-1]
# print(s3)
# s4 = s[-2]
# print(s4)
# #ABCD   切片 ：顾头不顾尾
# s5 = s[0:4]
# print(s5)
# s6 = s[0:-1]
# print(s6)
# s7 = s[:]
# s8 = s[0:]
# print(s7,s8)
# s9 = s[0:0]
s = 'ABCDLSESRF'  # s[首:尾:步长]
# s10 = s[0:5:2]
# print(s10)
s11 = s[4:0:-1]
print(s11)
s12 = s[3::-1]
print(s12)
s13 = s[3::-2]
print(s13)
s = 'ABCDLSESRF'
s14 = s[-1::-1]
print(s14)
s15 = s[::-1]
print(s15)

#字符串的操作

#s = 'alexWUsir'
# s1 = s.capitalize()  #首字母大写
# print(s1)

# 全大写，全小写
s2 = s.upper()
s21 = s.lower()
# print(s2,s21)
'''
s_str= 'acEQ1'
you_input =input('请输入验证码，不区分大小写')
if s_str.upper() == you_input.upper():
    print('输入成功')
else:
    print('请重新输入')
'''
#大小写翻转
# s3 = s.swapcase()
# print(s3)

# 每个隔开(特殊字符或者数字)的单词首字母大写
# s = 'alex*egon-wusir'
# s4 = s.title()
# print(s4)
# s = 'fade,crazy*w4rri0r_songsong node_3'
# s4 = s.title()
# print(s4)

#居中，空白填充
# s = 'alexWUsir'
# s5 = s.center(20,'~')
# print(s5)

# s = 'alex二哥'
# #公共方法
# l = len(s)
# print(l)

# 判断以什么为开头,结尾endswith
#s = 'alexWUsir'
# s7 = s.startswith('alex')
#s8 = s.startswith('e',2,5)
# print(s7)
#print(s8)

# find 通过元素找索引，找不到返回-1
# index通过元素找索引，找不到报错
# s = 'alexWUsir'
# s8 = s.find('A')
# s81 = s.index('A')
# print(s81,type(s8))


#strip rstrip lstrip
#strip 前后一起删
# strip 默认删除前后空格
# s = 'alexWUsir%'
# s9 = s.strip('%')
# print(s9)
# s = ' *a%lexWUsi* r%'
# s91 = s.strip(' %*')
# print(s91)

#统计个数，没有返回0
# s = 'alexaa wusir1'
# # s11 = s.count('al')
# # print(s11)

#字符串转化为列表
# s = ';alex;wusir;taibai'
# s12 = s.split(';')
# print(s12)

#format的三种玩法 格式化输出
# s = '我叫{}，今年{}，爱好{}，再说一下我叫{}'.format('太白',36,'girl','太白')
# print(s)
# name = input('请输入名字：')
# s = '我叫{0}，今年{1}，爱好{2}，再说一下我叫{0}'.format(name,36,'girl')
# print(s)
# name = input('请输入名字：')
# s = '我叫{name}，今年{age}，爱好{hobby}，再说一下我叫{name}'.format(age=18,name=name,hobby='girl')
# print(s)

#替换
# s = '来看待街坊邻居复合大师街坊法好的撒见客户'
# s11 = s.replace('街坊','老王',1)
# print(s11)

#####is系列
name='jinxin123'
print(name.isalnum()) #字符串由字母或数字组成
print(name.isalpha()) #字符串只由字母组成
print(name.isdigit()) #字符串只由数字组成

#如：content = input(‘请输入内容:’)  # 如用户输入：5+9或5+ 9或5 + 9，然后进行分割再进行计算。

# content=input('>>>').strip()
# con1=content.split('+')
# num=0
# for i in con1:
#     num+=int(i)
# print(num)
第二种方法：
# content=input('>>>').strip()
# index = content.find("+")
# a = int(content[0:index])
# b = int(content[index+1:])
# print(a + b)

#咱们任意输入一串文字+数字 统计出来数字的个数

s = input("请输入：")  # '1234324324fdsaf1fdsaf12'
count = 0
for i in s:
    if i.isdigit():
        count += 1
print(count)