实验一

Task1_1

print('hey, u')

print('hey',' u')

x,y,z = 1,2,3

print(x, y, z)

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}')

print(x)
print(y)
print(z)

print(x, end=' ')
print(y, end=' ')
print(z)

Task1_2

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3'))
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*'=')

print的用法

print(x,y)

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}')

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)}')

eval()可以将字符串转换为python表达式

Task3

from decimal import Decimal
ans1 = 0.1+0.2
print(f'0.1+0.2 = {ans1}')
ans2 = Decimal('0.1')+Decimal('0.2')
print(f'0.1+0.2 = {ans2}')

由于二进制与十进制之间不能完全转化故会存在误差。decimal 模块旨在支持“无偏差，精确无舍入的十进制算术（有时称为定点数算术）和有舍入的浮点数算术”。

Task4

# chr()返回unicode编码对应的字符
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))

# ord()返回字符的unicode编码
print(ord('a'), end = " ")
print(ord('b'), end = " ")
print(ord('c'))

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

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

chr()返回值是当前整数对应的 ASCII 字符。

ord()返回值是对应的十进制整数。

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('请输入一个数字：'))
y=x**365
print(f'{x}的365次方：{y:.10f}')

Task7

import math

T0=eval(input('请输入初始温度：'))
Tw=100
Ty=70
ρ=1.038
c=3.7
K=5.4*10**(-3)
M=67
t=((M**(2/3)*c*ρ*(1/3))/(K*math.pi**2*(4*math.pi/3)**(2/3)))*math.log(0.76*(T0-Tw)/(Ty-Tw))
fenzhong=math.floor(math.ceil(t)/60)
miao=math.ceil(t)-fenzhong*60
print(f'T0 = {T0}℃,t = {fenzhong}分{miao}秒')