字符串
Python 的数据类型
Jason Myers
Instructor
创建格式化字符串
- f 字符串（格式化字面量）-
f""
cookie_name = "Anzac"
cookie_price = "$1.99"
print(f"Each { cookie_name } cookie costs { cookie_price }.")
"Each Anzac cookie costs $1.99."
用字符串连接
"".join()用调用它的字符串连接一个可迭代对象
child_ages = ["3", "4", "7", "8"]
print(", ".join(child_ages))
"3, 4, 7, 8"
print(f"The children are ages {','.join(child_ages[0:3])}, and {child_ages[-1]}.")
"The children are ages 3, 4, 7, and 8."
匹配字符串的部分
.startswith()和.endswith()判断字符串是否以某字符或子串开头/结尾
boy_names = ["Mohamed", "Youssef", "Ahmed"]
print([name for name in boy_names if name.startswith('A')])
["Ahmed"]
- 注意：这些方法及大多数字符串函数区分大小写。
在字符串中搜索
in运算符可在字符串等可迭代对象中查找值。
"long" in "Life is a long lesson in humility."
True
"life" in "Life is a long lesson in humility."
False
实现不区分大小写的一种方法
.lower()方法返回小写字符串
"life" in "Life is a long lesson in humility.".lower()
True
Passons à la pratique !
Python 的数据类型
