list=[1,23,34,4]
for i in range(0,len(list)):
    print(list[i])
list.remove(34);
for i in range(0,len(list)):
    print(list[i])
print("shixinfa");
a=10;
b=20;
c=a+b;
print(a+b);
a=100
if a>=0:
    print (a);
else:
    print (-a);
print(3>9);
data=ord('A');
print(data)
result=chr(88);
print(result);
length=len("BCD")
print(length)
classmates=['shixinfa','zhangyan','lilaoshi']
classmates.append('sdfg')
classmates.insert(1,'wsx')
for i in range(0,len(classmates)):
    print(classmates[i]);
tuple=(2,3,5);
len=len(tuple);
print(len)
d={'shixinfa':23,'zhangyan':34,'tom':89}
print(d['zhangyan'])
sum = 0
for x in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]:
    sum = sum + x
print(sum)
print(abs(-29))
print(int(20.89))
def my_abs(x):
    if x>=0:
        return x;
    else:
        return -x;
print(my_abs(-99))
def power(x, n):
    s = 1
    while n > 0:
        n = n - 1
        s = s * x
    return s
print(power(4,2));
dd = {'a': 1, 'b': 2, 'c': 3}
for key in dd:
    print(key)