print("welcome")

type(2)
type(2.2)
type(2000000)
type(True)
type('a')

number = 2
real = 2.2
word = "word"
pint(word)
type(word)
a = b = c = 1.5
print(a)
print(b)
print(c)
one, two, three = 1, 'two', 'three'
print(one)
print(two)
print(three)
number = 1
str = 'string'
number = str

print(2.0+5)
print(10.0-5)
print(40*3*0.5)
print(2**3) # 乘方

string = '012345'
print(string[2:5])
print(string[:5])
print(string[3])
string2 = ('con' + 'sole') * 2
print(string2)
i = "I"
can = "can"
print(i + can);
word = "Ford"
word = "L" + word[1:]
print(word)
word([2]) = "f"  # 会报错，字符串不允许修改
# 这种写法表示内部的字符不转义
print(r'c:numbernan')
# 如果这里没有会多一个空行
print('''
  hello:
    world
    world
  ''');
print("今天星期{0},天气{1}".format(3,"晴天"))
print('prices:({x}, {y}, {z})'.format(x = 2.0, y = 1.5, z = 5))
print("the {vehicle} had {0} crashes in {1} months".format(5,6,vehicle = 'car'))
print('{:<20}'.format("text"))
print('{:>20}'.format("text"))
print('{:b}'.format(21))  # 转二进制
print('{:x}'.format(21))  # 转八进制
print('{:o}'.format(21))  # 转十六进制