用表格帮你了解Python数据类型

小写字母、数字、下划线组成

b = "is a 'girl'"
print("b =", b)

c = 'Is a "girl"'
print("c = ", c)

输出：

b = is a 'girl'
c = Is a "girl"

不能使用相同的引号

比如 b = 'is a 'girl''
^^^^
SyntaxError: invalid syntax

空格

制表符 \t

换行符 \n

d = "find"
e = "who"
f = d + " " + e
print("f =", f)
print("xxxx\nxxxx")
print("yyyy\tyyyy")

输出：

f = find who
xxxx
xxxx
yyyy yyyy

输出：

c = Is a "girl"

title = Is A "Girl"
upper = IS A "GIRL"
lower = is a "girl"

输出，用红色标记空格：

' a b c '
'a b c '
' a b c'
'a b c'

常见的

除法结果是浮点：

0.6666666666666666

n1 = 3
n2 = 2

print(n1 + n2 * 3)
print((n1 + n2) * 3)

用括号来明确运算次序

输出：

9

15

数字直接转字符串：

print(str(3) + " find")

数字相关变量转字符串：

n1 = 3
print(str(n1) + " find")