1.定义一个很大的数
a = 1000000000
print(a)
b = 10 * 10000 * 10000
print(b)
c = 10_0000_0000
print(c)
2.交换两个变量的值
a = 10
b = 20
c = a
a = b
b = c
print("a={}, b={}".format(a, b))
a = 30
b = 40
b, a = a, b
print("a={}, b={}".format(a, b))
3.连续不等式的写法
a = 85
if a >= 80 and a <= 100:
print("优秀")
if 80 <= a <= 100:
print("优秀")
4.字符串的乘法
print("==============================")
print("="*30)
5.列表拼接
a = [1, 2, 3, 4, 5]
b = [6, 7, 8, 9, 10]
c = a + b
print(c)
6.列表切片,左闭右开区间
a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
print(a[3:7])
print(a[3:-3])
print(a[-2])
print(a[:3])
print(a[-4:])
7.元组的解包和打包
a = (1, 2, 3)
x, y, z = a
print("x={}, y={}, z={}".format(x, y, z))
b = (z, y, x)
print(b)
8.with语句
f = open("./test.txt", "r")
data = f.read()
print(data)
f.close()
with open("./test.txt", "r") as f:
data = f.read()
print(data)
9.列表推导式
a = [1, 2, 3]
b = []
for e in a:
b.append(e + 200)
print(b)
c = [e+100 for e in a]
print(c)