Mosh的Python教程练习1

输出病人信息（学习定义变量）

name="John Smith"
age=20
is_newpatient=True
//不能简单把三个相加打印，类型不同（int str bool）

输出某人喜欢的颜色（学习输入）

name=input("What's your name? ")
favourite_color=input("What's your favourite color? ")
print(name+" likes "+favourite_color)
//可以把三个相加打印，类型相同（同int）

输出年龄和变量类型（类型转换和打印变量类型）

***输出年龄（int强制类型转换）***
birth_year=int(input("Birth_year: "))
age=2020-birth_year
print(age)

birth_year=input("Birth_year: ")
age=2020-int(birth_year)
print(age)

***输出变量类型***
birth_year=input("Birth_year: ")
print(type(birth_year))//
age=2020-int(birth_year)
print(type(age))//
print(age)

磅和Kg的转化（类型转换）

weight_lbs = input("Weight (lbs): ")
weight_kg = float(weight_lbs) * 0.45
print(weight_kg)

字符串的引号使用注意

1 用''或者""来定义字符串
2 ''或者""在字符串中出现，造成不匹配：
如： str1='Gloria's house'   
     str1="Gloria's house"
     str2="Python Course for "beginners" "
     str2='Python Course for "beginners" '
3 多行文本用""" """或者''' '''
email="""
		Hi,Doggy

		This is my first Python class. I fancy you.

		Hope you watch this.

		Love from,
		Meow
"""
print(email)

索引

str="Python Course for Beginners"
print(str[0])     #结果：P
print(str[1])     #结果：y
print(str[-1])    #结果：s
print(str[:])     #结果：Python Course for Beginners
print(str[0:])    #结果：Python Course for Beginners
print(str[:3])    #结果：Pyt
print(str[0:3])   #结果：Pyt
print(str[1:-1])  #结果：ython Course for Beginner
another=str[1:5]  #结果：ytho
print(another)

字符串连接和格式化字符串

first="John"
last="Smith"
message=first+" ["+last+"] is a coder."
msg=f'{first} [{last}] is a coder.'
print(message)
print(msg)
# John [Smith] is a coder.

字符串方法

在这里插入代码片