task1_1.py

 1 print('hey, u')
 2 print('hey', ' u')
 3 x,y,z = 1,2,3
 4 print(x, y, z)
 5 print('x = %d, y = %d, z = %d' %(x,y,z))
 6 print('x = {}, y = {}, z = {}'.format(x,y,z))
 7 print(f'x = {x}, y = {y}, z = {z}')
 8 print(x)
 9 print(y)
10 print(z)
11 print(x, end=' ')
12 print(y, end=' ')
13 print(z)

 

 task1_2.py

 1 x1, y1 = 1.2, 3.57
 2 x2, y2 = 2.26, 8.7
 3 print('{:-^40}'.format('输出1'))
 4 print('x1 = {}, y1 = {}'.format(x1, y1))
 5 print('x2 = {}, y2 = {}'.format(x2, y2))
 6 print('{:-^40}'.format('输出2'))
 7 print('x1 = {:.1f}, y1 = {:.1f}'.format(x1, y1))
 8 print('x2 = {:.1f}, y2 = {:.1f}'.format(x2, y2))
 9 print('{:-^40}'.format('输出3'))
10 print('x1 = {:<15.1f}, y1 = {:<15.1f}'.format(x1, y1))
11 print('x2 = {:<15.1f}, y2 = {:<15.1f}'.format(x2, y2))
12 print('{:-^40}'.format('输出3'))
13 print('x1 = {:>15.1f}, y1 = {:>15.1f}'.format(x1, y1))
14 print('x2 = {:>15.1f}, y2 = {:>15.1f}'.format(x2, y2))

 

task1_3.py

1 name1, age1 = 'Bill', 19
2 name2, age2 = 'Hellen', 18
3 title = 'Personnel Information'
4 print(f'{title:=^40}')
5 print(f'name: {name1:10}, age: {age1:3}')
6 print(f'name: {name2:10}, age: {age2:3}')
7 print(40*'=')

 

实验一(总结):

print输出的几种用法:

1.输出单个字符串或单个变量 

2.输出多个数据项,用逗号分隔   

3.用户混合字符串和变量值   

4.换行

 

2.实验任务2

task2_1.py

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

 

task2_2.py

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

 

函数eval()的用法:

1.把字符串转换为python表达式,相当于把圆括号中内容两侧的引号去掉    2.组合使用内置函数eval()和input()

 

3.实验任务3

task3.py

1 ans1 = 0.1 + 0.2
2 print(f'0.1 + 0.2 = {ans1}')
3 from decimal import Decimal
4 ans2 = Decimal('0.1') + Decimal('0.2')
5 print(f'0.1 + 0.2 = {ans2}')

line4存在误差:二进制计算中浮点数无法精确表示,只能舍入后存储

Decimal运算:基于整数或浮点数构造将执行该整数或浮点值的精确转换,以十进制方法计算,因此不会产生二进制计算中的误差。

 

4.实验任务4

task4.py

 1 print(chr(0x1f600), end = " ")
 2 print(chr(0x1f601), end = " ")
 3 print(chr(0x1f602), end = " ")
 4 print(chr(0x1f603), end = " ")
 5 print(chr(0x1f604))
 6 print(chr(10000), end=" ")
 7 print(chr(0x025b), end=" ")
 8 print(chr(0x2708), end=" ")
 9 print(chr(0x00A5), end=" ")
10 print(chr(0x266b))
11 print(ord('a'), end = " ")
12 print(ord('b'), end = " ")
13 print(ord('c'))
14 print(ord('A'), end = " ")
15 print(ord('B'), end = " ")
16 print(ord('C'))
17 print(ord('0'), end = " ")
18 print(ord('1'), end = " ")
19 print(ord('2'))

 

chr()和ord()作用:

ord函数返回一个字符对应的unicode编码,chr函数反过来,返回一个unicode编码对应的字符。

 

5.实验任务5

task5_1.py

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

 

task5_2.py

 1 from math import pi
 2 text = '''
 3 好奇心是人的天性。
 4 理想情况下,学习新东西是让人愉快的事。
 5 但学校里的学习似乎有点像苦役。
 6 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。
 7 '''
 8 print(text)
 9 r = float(input('给学习画一个大饼,大饼要做的很大,半径要这么大: '))
10 circle = 2*pi*r
11 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...')

 

6.实验任务6

task6.py

1 x=float(input("从键盘输入:"))
2 y=x**(365)
3 print(x,"的365次方:",y)

 

7.实验任务7

task7.py

from math import pi
from math import log
p=1.038
c=3.7
K=5.4*10**(-3)
M=67
Tw=100
Ty=70
To=float(input("从键盘输入To=:"))
t=(M**(2/3)*c*p**(1/3))/(K*pi**2*((4*pi)/3)**(2/3))*log(0.76*((To-Tw)/(Ty-Tw)))
print(f"To={To}°C,t={t//60}分{t%60}秒")

 

五、实验总结

·print(),eval(),chr(),ord()的用法,二进制浮点运算出现误差的原因,python的简洁,复杂函数的运算等。

 

我,感觉,好难......哭泣.jpg,但是又好开心