1、計算長度len
name = 'Alex'
print(len(name))
輸出結果：4
2、大小寫轉換（lower、upper)
大--小lower
name = 'ALEX'
print(name.lower())
小--大upper
name = 'alex'
print(name.upper())
例子：
s_str = 'acEQ'
you_input = input("請輸入驗證碼，不區分大小寫:")
if s_str.upper() == you_input.upper():
print("輸入成功")
else:
print("請重新輸入")
3、大小寫翻轉swapcase
s = 'alexWUsir'
s1 = s.swapcase()
print(s1)
4、全部翻轉
a = 'suowei'
d = a[::-1]
print(d)
輸出結果：iewous
5、字符串替換join
v = '_'
r = ['k','l']
print(v.join(r))
輸出結果：k_l
6、分割字符串split
a = 'a_b_n'
print(a.split('_'))
輸出結果：['a', 'b', 'n']
7、每個隔開的單詞首字母大寫title
s = 'alex*egon-wusir'
s4 = s.title()
print(s4)
8、通過元素找索引find
s = 'alexWUsir'
s8 = s.find('W')
print(s8,type(s8))
9、默認刪除前後空格strip
#把空格去掉
s = 'alexWUsir%'
s9 = s.strip('%')
print(s9)
s = '*alexWUsir%'
s91 = s.strip('%*')
print(s91)
#strip默認刪除前後空格
username = input("請輸入名字: ").strip()
if username =="春哥":
print("恭喜發財春哥")
10、默認刪除前後空格replace
s = '來看待街坊鄰居在大富科技城城順大富科技'
s11 = s.replace('街坊','老王',1)
print(s11)
11、字符串for
s = 'klfdfkjfdf'
for i in s:
print(i)
s = 'jfdkjf蒼井空kjfdkdj'
if '蒼井空' in s:
print("您的評論有敏感詞...")
12、字符串的索引與切片
s = 'ADCDLSESSRF' #s[首:尾:步長]
索引
s1 = s[0]
print(s1)
s2 = s[2]
print(s2)
s3 = s[-1]
print(s3)
s4 = s[-2]
print(s4)
s5 = s[0:3]
print(s5)
s6 = s[0:-1]
print(s6)
s7 = s[:]
s8 = s[0:]
print(s7,s8)
s9 = s[0:0]
print(s9)
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)
s14 = s[-1::-1]
print(s14)
s = 'asdfer'
for i in s:
print(i)
index = 0
while 1:
print(s[index])
index += 1
if index == len(s):break
content = input('>>>:').strip()
con1 = content.split('+')
#list[]
num = 0
for i in con1:
num += int(i)
print(num)
s = '132a4b5c'
s1 = s[0]+s[2]+s[1]
print(s1)
s = input("請輸入: ")
count = 0
for i in s:
if i.isdigit():
count +=1
print(count)
13、字符串格式化
1、%s %d
'http://www.baidu.com/page=%s'%1
2、format
'http://www.baidu.com/page={}'format(1)
格式化str
>>>a='hello %s'%'world'
格式化int
>>>a='number is %d'%20
格式化float
>>>a='number is %f'%20.1
格式化多個
>>>a='%s is %s'%('lr','cool')
字典格式化字符串
>>>a='%(name)s age is %(age)d'%{'name':'lr','age':18}
常用方式
>>>cu.execute("insert into test values(%s,%d)"%('lr',1234))
#format的三種玩法,格式化輸出
# s = '我叫{},今年{},愛好{},再說一下我叫{}'.format('小明',23,'girl','小明')
# print(s)
# s = '我叫{0},今年{1},愛好{2},再說一下我叫{0}'.format('小明',23,'girl')
# print(s)
# s = '我叫{name},今年{age},愛好{hobby},再說一下我叫{name}'.format(name='小明',age=23,hobby='girl')
# print(s)
14、其他
name = "my \\tname is alex"
print(name.capitalize()) #首字大寫
print(name.count("a")) #a有多少字符
print(name.center(50,"-")) #50中間
print(name.endswith("ex")) #以ex結尾
print(name.startswith("my")) #以my開頭
print(name.expandtabs(tabsize=30))
format :
>>> msg = "my name is {}, and age is {}"
>>> msg.format("alex",22)
'my name is alex, and age is 22'
>>> msg = "my name is {1}, and age is {0}"
>>> msg.format("alex",22)
'my name is 22, and age is alex'
>>> msg = "my name is {name}, and age is {age}"
>>> msg.format(age=22,name="ale")
'my name is ale, and age is 22'
format_map
>>> msg.format_map({'name':'alex','age':22})
'my name is alex, and age is 22'
#使用while和for循環分別打印字符串s=’asdfer’中每個元素。
s = 'asdfer'
for i in s:
print(i)
index = 0
while 1:
print(s[index])
index += 1
if index == len(s):break
#如：content = input(‘請輸入內容:’) # 如用戶輸入：5+9或5+ 9或5 + 9，然後進行分割再進行計算。
content = input('>>>:').strip()
con1 = content.split('+')
#list[]
num = 0
for i in con1:
num += int(i)
print(num)
content=input('>>>').strip()
index = content.find("+")
a = int(content[0:index])
b = int(content[index+1:])
print(a + b)
#咱們任意輸入一串文字+數字 統計出來數字的個數
s = input("請輸入: ")
count = 0
for i in s:
if i.isdigit():
count +=1
print(count)
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