data entry and if statement

1.4 Data Input

1.4.1input

data can be received
information that can be prompted

1. Simple operation

# 读取键盘输入的数据
x=input("输入数据")
print(x)

The prompt is equivalent to

# 读取键盘输入的数据
x=input("输入数据")
print(x)

print("输入数据")
x=input()
print(x)

2. The input data is str type

Whatever is entered is a string

print("输入数据")
x=input()
print(x)

print(type(x))

1.4.2 input summary

summary

1.4.3 Logic _ _ _ _

1. The Boolean type is used to represent

Note that it is all capitalized

2. Conditional expressions are used to represent the results of Boolean type judgments

3. Definition

How are literals created?
How to get the result of a boolean calculation


#布尔类型都是大写的
print(True)
print(False)

# 判断后的
b=True
c=False
print(b)
print(c)
print(type(b))

output literal

other comparisons

# 数字比较
print(10==10)
print(5>10)
# 字符串比较
print('aa'=='cc')
print('aa'=='aa')

The comparison of inequalities, etc. are all ways that can be used for comparison

!= Varies

1.4.4if statement

Set the conditions for judgment and the actions corresponding to the conditions

The basic format of the if statement is inconsistent with that of Java, etc.
Pay attention to the indentation and the following: it is judged according to the indentation and belongs to the if

1. Basic grammar

Complete conditional statement

2. Case

# if语句的基本格式
age =input("输入你的年龄")
age=int(age)
if age>=18:
        print("你可以访问")
        print(age)
elif age>10 and age<18:
    print("你的年龄还不算大")
    print(age)
else:
    print("你的年龄太小了")
    print(age)

summary

1.4.5 Nested use judgment statement

It is to write a multi-layer judgment statement

Note that the indentation you write can all rely on indentation

# 嵌套判断语句
age=input("输入您的年龄：")
age=int(age)
if age>=18:
    print("可以游玩")
elif age>=15 and age<18:
    height=input("输入您的身高：")
    if int(height)>=160:
        print("2次判断：可以游玩")
    else:
        print("2次判断，不可以")
else:
    print("不可以")

summary

Just pay attention to the indentation

1.4.6 Case

guess the number

Pay attention to the function of guessing numbers


# 猜数字
# 随机生成1-10的数字
import random
num=random.randint(1,10)
print("随机生成的数字",num)

# 要猜测的数字
guess_num=input("要猜测的数字")
guess_num=int(guess_num)

# 判断要猜测的数字
if guess_num==num:
    print("恭喜你，第一次猜测成功了。")
else:
    if guess_num>num:
        print("猜的数字大了！")
    else:
        print("猜的数字小了！")
    # 继续进行2次猜测
    guess_num = input("要猜测的数字")
    guess_num = int(guess_num)
    if guess_num == num:
        print("恭喜你，第二次猜测成功了。")
    else:
        if guess_num > num:
            print("猜的数字大了！")
        else:
            print("猜的数字小了！")
        # 继续进行3次猜测
        guess_num = input("要猜测的数字")
        guess_num = int(guess_num)
        if guess_num == num:
            print("恭喜你，第三次猜测成功了。")
        else:
            print("很遗憾，三次都失败了")

Guess the graph

python---data input and if statement

data entry and if statement

1.4 Data Input

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