Python学习笔记之基础(二)变量和类型

1. 创建变量，输出变量

savings = 100
print(savings)

2. 变量运算

savings = 100
factor = 1.10
result = savings * factor ** 7

print(result)

3. 符串和布尔型变量

desc = "compound interest"
profitable = True

print(desc)
print(profitable)

4. 查看变量类型

savings = 100
factor = 1.1
desc = "compound interest"

year1 = savings * factor

print(type(savings))

print(type(year1))

print(type(desc))

 

5. 字符串拼接

直接用加号就能实现字符串的拼接，或者使用 * 数字  来实现字符串的重叠复制。

desc = "compound interest"
doubledesc = desc + desc

print(doubledesc)

 6. 基本类型转换

基本类型转换函数：int(), float(), bool(), str()

savings = 100
result = 100 * 1.10 ** 7

print("I started with $" + str(savings) + " and now have $" + str(result) + ". Awesome!")

pi_string = "3.1415926"

pi_float = float(pi_string)

print(pi_float)