totalCount ='100abc'
totalCount = re.sub("\D","", totalCount)
re.sub(pattern,repl,string,count=0,flags=0)
在字符串 string 中找到匹配正则表达式 pattern 的所有子串，用另一个字符串 repl 进行替换。如果没有找到匹配 pattern 的串，则返回未被修改的 string。Repl 既可以是字符串也可以是一个函数。由此可分析上面使用的语句的含义：在'100abc'这个字符串中找到非数字的字符（正则表达式中'\D'表示非数字），并用""替换，然后返回的就是只剩下数字的字符串。
含有有小数点正则位可以是[^0-9|.]
string.ascii_lowercase
print[chr(i)foriinrange(65,91)]#所有大写字母
print[chr(i)foriinrange(97,123)]#所有小写字母
print[chr(i)foriinrange(48,58)]#所有数字
import string#导入string这个模块
string.digits#输出包含数字0~9的字符串
string.letters#包含所有字母(大写或小写)的字符串
string.lowercase#包含所有小写字母的字符串
string.uppercase#包含所有大写字母的字符串
string.punctuation#包含所有标点的字符串
string.ascii_letters#与string.letters一样
Python 3.6.2 (v3.6.2:5fd33b5, Jul 8 2017, 04:57:36) [MSC v.1900 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> import re
>>> re.findall('(d)\1+','33abcd112')
[]
>>> len('SDIBT')
5
>>> sorted(random.sample(range(5),5))
Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
sorted(random.sample(range(5),5))
NameError: name 'random' is not defined
>>> import random
>>> sorted(random.sample(range(5),5))
[0, 1, 2, 3, 4]
>>> isinstance('4',(int,float,complex))
False
>>> min(['11','2','3'])
'11'
>>> g=lambda x,y=3,z=5:x+y+z
>>> g(2)
10
>>> [1,2]+[3]
[1, 2, 3]
>>> list(filter(None,[0,1,2,3,0,0]))
[1, 2, 3]
>>> int('123',8)
83
>>> x=[3,5,7]
>>> x[:3]=[2]
>>> x
[2]
>>> [index for index,value in enumerate([3,5,7,3,7]) if value==max([3,5,7,3,7])]
[2, 4]
>>> (1)+(2)
3
>>> 3<<2
12
>>> x={'a':'b",'c':'d'}
SyntaxError: invalid syntax
>>> x={'a':'b','c':'d'}
>>> 'a' in x
True
>>> for i in range(3):print(i,end=',')
;
SyntaxError: invalid syntax
>>> for i in range(3):print(i,end=',')
;
SyntaxError: invalid syntax
>>> for i in range(3):print(i,end=',');
0,1,2,
>>> type(3+4j) in (int,float,complex)
True
>>> dir
<built-in function dir>
>>> x=(3,)
>>> x*3
(3, 3, 3)
>>> '%c'%65==str(65)
False
>>> sum(range(1,10))
45
>>> x=[1,2,3,2,3]
>>> x.remove(2)
>>> x
[1, 3, 2, 3]
>>> x={1:1}
>>> x[2]=2
>>> len(x)
2
>>> x=3
>>> x+=6
>>> x
9
>>> x=[1,2]
>>> x.append([3])
>>> x
[1, 2, [3]]
>>> x=[1,2,3,2,3]
>>> x.pop()
3
x
>>>
>>> x
[1, 2, 3, 2]
>>> [1,2,3].count(4)
0
>>> int('123')
123
>>>
======================== RESTART: F:\myPython\test.py ========================
Traceback (most recent call last):
File "F:\myPython\test.py", line 10, in <module>
sort(i1,i2,i3,i4)
NameError: name 'sort' is not defined
>>>
======================== RESTART: F:\myPython\test.py ========================
Traceback (most recent call last):
File "F:\myPython\test.py", line 10, in <module>
sorted(i1,i2,i3,i4)
TypeError: sorted() takes at most 3 arguments (4 given)
>>>
======================== RESTART: F:\myPython\test.py ========================
>>>
======================== RESTART: F:\myPython\test.py ========================
>>> a
[5, 5, 5]
>>>
======================== RESTART: F:\myPython\test.py ========================
>>> a
[2, 3, 4]
>>>
======================== RESTART: F:\myPython\test.py ========================
>>> a
[2, 3, 4, 5]
>>> a[0]
2
>>>