整理了12个必备的Python函数，建议收藏

f = 30.5
ff = str(f)
print(type(ff))
#输出结果为 class 'str'

s = int(input("请输入分数:"))
if 80 >= s >= 60:
 print("及格")
elif 80 < s <= 90:
 print("优秀")
elif 90 < s <= 100:
 print("非常优秀")
else:
 print("不及格")
 if s > 50:
 print("你的分数在60分左右")
 else:
 print("你的分数低于50分")

l = [1,2,2,3,6,4,5,6,8,9,78,564,456]
n = l.index(6, 0, 9)
print(n)
#输出结果为4

#取元组下标在1~4之间的3个数，转换成列表
t = (1,2,3,4,5)
print(t[1:4])
l = list(t)
print(l)
#在列表下标为2的位置插入1个6
l[2]=6
print(l)
#讲修改后的列表转换成元组并输出
t=tuple(l)
print(t)

#运行结果为：
(2, 3, 4)
[1, 2, 3, 4, 5]
[1, 2, 6, 4, 5]
(1, 2, 6, 4, 5)

"{0} 嘿嘿".format("Python")
a=100
s = "{0}{1}{2} 嘿嘿"
s2 = s.format(a,"JAVA","c++")
print(s2)
#运行结果为：100JAVAC++ 嘿嘿

a=100
s = "{}{}{} 嘿嘿"
s2 = s.format(a,"JAVA","C++","C# ")
print(s2)
#运行结果为：100JAVAC++ 嘿嘿

s = "{a}{b}{c} 嘿嘿"
s2 = s.format(b="JAVA",a="C++",c="C# ")
print(s2)
#运行结果为：C++JAVAC#嘿嘿

d = {"name": "小黑"}
print(d.get("name2", "没有查到"))
print(d.get("name"))
#运行结果为：
没有查到
小黑

def fun1():
 global b
 b=100
 print(b)
fun1()
print(b)

#运行结果为：
100
100

#多线程的创建
class MyThread(threading.Thread):
 def __init__(self,name):
 super().__init__()
 self.name = name
 def run(self):
 #线程要做的事情
 for i in range(5):
 print(self.name)
 time.sleep(0.2)
#实例化子线程
t1 = MyThread("凉凉")
t2 = MyThread("最亲的人")
t1.start()
t2.start()

from my_package1 import my_module3
print(my_module3.a)
my_module3.fun4()

class B:
 age = 10
 def __init__(self,name):
 self.name = name
 @classmethod
 def eat(cls): #普通函数
 print(cls.age)
 def sleep(self):
 print(self)
b = B("小贱人")
b.eat()
#运行结果为:10

import re
s = "abcabcacc"
l = re.split("b",s)
print(l)
#运行结果为：['a', 'ca', 'cacc']