1、python md5加密：

str="aa"
md5 = hashlib.md5()
md5.update(str.encode('utf-8'))
sign = md5.hexdigest()

2、python去掉小数点后面多余的0：

print('{:g}'.format(0.2000))
# 0.2

3、判断数据类型：

a = 1
b = [1,2,3,4]
c = (1,2,3,4)
d = {‘a‘:1,‘b‘:2,‘c‘:3}
e = "aaa"
if isinstance(a,int):
    print "a is int"
if isinstance(b,list):
    print "b is list"
if isinstance(c,tuple):
    print "c is tuple"
if isinstance(d,dict):
    print "d is dict"
if isinstance(e,str):
    print "d is str"

4、获取字符串中的数字：

extract_digit = lambda x: re.sub("[^\d\.]", "", x)
s = "这是数字123！"
number = extract_digit(s) #123

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