学习python

变量
a=1
b=2
c=a+b
print(c)
判断
a=100
if a>=0:
    print(100)
else:
    print(1000)
循环
names=['yang','li','zhang']
for name in names:
    print(name)
sum=0

for x in range(100):
    sum+=x
print(sum)
函数
def my_function(x):
    if x>100:
        return 100
    else:
        return -100
a=my_function(99)
b=my_function(1000)
print(a)
print(b)
类
class Student(object):
    """docstring for Student"""
    def __init__(self, name,age,sorce):
        super(Student, self).__init__()
        self.name = name
        self.age = int(age) 可以被外部访问
        self.__age=int(age)不可以被外部访问  私有的 __相当于private
        self.sorce =sorce
    def get_grade(self):
        if self.sorce>=90:
            return 'A'
        elif self.sorce>=60:
            return "B"
        else:
            return "C"
    def get_age_stage(self):
        if self.age<14:
            return 'juvenile'
        elif self.age<30:
            return 'youth'
        elif self.age<60:
            return 'middle'
        else:
            return 'oldman'
a=Student("ccc",19,99)
print(a.name)
print(a.get_grade())
print(a.get_age_stage())