Python的与用户交互
input(\'请输入帐号\')
input(\'请输入密码\')
注意：input接受的是字符串
Python2的input和raw_input（了解）
-
Python2的raw_input就是python3的input
-
python2的input需要用户自己输入数据类型
格式化输出
- 把字符串按照一定格式打印或者填充
占位符
- 在字符串中，利用%来表示一个特殊的含义，对字符进行格式化
- %d：后面应该放入一个整数
- %s：后面应该放入一个字符串
- 如果字符串中有占位符，则有几个占位符必须有几个实际内容代替，或者一个也没有
name = \'test\'
age = 19
print(\'My name is %s, my age is %d\' % (name, age))
my name is test, my age is 19
format函数格式化字符串
- 在使用上，用{}和：代替%号，后面跟format与参数完成
- {}内不填参数
name = \'test\'
age = 19
print(\'My name is {}, my age is {}.\'.format(name, age))
My name is test, my age is 19.
- {}内填写索引值
name = \'test\'
age = 19
print(\'My name is {1}, my age is {0}.\'.format(age, name))
My name is test, my age is 19.
- {}内填写准确变量名
name = \'test\'
age = 19
print(\'My name is {name}, my age is {age}.\'.format(name=name, age=age))
My name is test, my age is 19.
f-string格式化（方便）
- 和format有些类似，在引号前放一个f，后面需要格式化的地方用{变量名}即可
- :.2f ：保留两位小数
name = \'test\'
age = 19
print(f\'My name is {name}, my age is {age}.\')
print(f\'My name is {name}, my age is {age:.2f}.\')
My name is test, my age is 19.
My name is test, my age is 19.00.