实验1 Python开发环境使用和编程初体验作业

#用于输出单个字符串或变量
print('hey,u')
#用于输出多个数据项，逗号分隔
print('hey','u')
x,y,z = 1,2,3
print(x,y,z)
#用户混合字符串和变量值
print('x=%d,y=%d,z=%d'%(x,y,z))
print('x={},y={},z={}'.format(x,y,z))
print(f'x={x},y={y},z={z}')
#输出后是否换行
print(x)
print(y)
print(z)
print(x,end='')
print(y,end='')
print(z)

task1_1　　

 

task1_2

#对输出数据格式化
x1,y1 = 1.2,3.57
x2,y2 = 2.26,8.7

print('{:-^40}'.format('输出1'))
print('x1 = {},y1 = {}'.format(x1,y1))
print('x2 = {},y2 = {}'.format(x2,y2))

print('{:-^40}'.format('输出2'))
print('x1 = {:.1f},y1 = {:.1f}'.format(x1,y1))
print('x2 = {:.1f},y2 = {:.1f}'.format(x2,y2)) 

print('{:-^40}'.format('输出3'))
print('x1 = {:<15.1f},y1 = {:<15.1f}'.format(x1,y1))
print('x2 = {:<15.1f},y2 = {:<15.1f}'.format(x2,y2))

print('{:-^40}'.format('输出4'))
print('x1 = {:>15.1f},y1 = {:>15.1f}'.format(x1,y1))
print('x2 = {:>15.1f},y2 = {:>15.1f}'.format(x2,y2))

 

 task1_3

name1,age1 = 'Bill',19
name2,age2 = 'Hellen',18
title = 'Personnel Information'
print(f'{title:=^40}')
print(f'name:{name1:10},age;{age1:3}')
print(f"name:{name2:10},age:{age2:3}")
print(40*'=')

 

 task2_1

r1 = eval('1+2')
print(type(r1),r1)
r2 = eval('[1,6,7.5]')
print(type(r2),r2)
r3 = eval('"python"')
print(type(r3),r3)
r4 = eval('7,42')
print(type(r4),r4)

 

 task2_2

x,y = eval(input('Enter two oprands:'))
ans = x+y
print(f'{x} + {y} = {ans}')
print(f'{type(x)} + {type(y)} = {type(ans)}')

 

 总结：eval（）函数的作用是去掉字符串最外侧的引号,并按照Python的语法执行去掉引号后的字符内容

task3_1

ans1 = 0.1 + 0.2
print(f'0.1 + 0.2 = {ans1}')

from decimal import Decimal

ans2 = Decimal('0.1')+ Decimal('0.2')
print(f'0.1+0.2 = {ans2}')

 

 

总结：0.1，0.2在二进制浮点中没有精确的表达

　　　　Decimal()是将数字舍到十进制下的位数然后再进行运算

task4

print(chr(0x1f600),end = " ")
print(chr(0x1f601),end = " ")
print(chr(0x1f602),end = " ")
print(chr(0x1f603),end = " ")
print(chr(0x1f604))

print(chr(10000),end = " ")
print(chr(0x025b),end = " ")
print(chr(0x2708),end= " ")
print(chr(0x00A5),end= " ")
print(chr(0x266b))

print(ord('a'),end=" ")
print(ord('a'),end=" ")
print(ord('a'),end=" ")

print(ord('A'),end=" ")
print(ord('B'),end=" ")
print(ord('C'),end=" ")

print(ord('0'),end=" ")
print(ord('1'),end=" ")
print(ord('2'))

 

 task5_1

from math import sqrt
n = float(input('输入一个数:'))
ans1 = sqrt(n)
ans2 = n**0.5
print('%.2f的平方根是: %.2f' %(n, ans1))
print('{:.2f}的平方根是: {:.2f}'.format(n, ans2))
print(f'{n:.2f}的平方根是: {ans2:.2f}')

 

 task5_2

from math import pi
text = '''
好奇心是人的天性
理想情况下，学习新东西是让人愉快的事。
但学校里的学习似乎有点像苦役。
有时候，需要画一个大饼，每次尝试学一些新鲜的，才会每天变得更好一点点。
'''
print(text)
r = float(input('给学习画一个大饼，大饼要做的很大，半径要这么大: '))
circle = 2*pi*r
print(f'绕起来，大饼的圆周有这么长, {circle}, 够不够激发你探索未知的动力...')

 

 task6

x=eval(input('输入一个数：'))
y=x**365
print(f'{x}的365次方：{y}')

 

 task7

from math import pi
import math

M=67
p=1.038
c=3.7
K=5.4e-3

Tw=100
Ty=70
T0=eval(input('放入水中之前蛋的原始温度（以℃计）：'))

t0=0.76*(T0-Tw)/(Ty-Tw)
t0=math.log(t0)

t1=((M**(2/3)*c*p**(1/3)*t0)/(K*pi**2*(4*pi/3)**(2/3)))//60

t2=((M**(2/3)*c*p**(1/3)*t0)/(K*pi**2*(4*pi/3)**(2/3)))-t1*60
print(f'T0={T0}℃,{t1:.0f}分{t2:.0f}秒')