Python练习册

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Practices 1:

$ cat 1.py 
#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 11:20:39 AM CST
#!/usr/bin/env python3
sum = 0
for i in range(1, 11):
    sum += 1.0 / i
    print("{:3d} {:6.4f}".format(i , sum))

$ cat 1.py

#!/usr/bin/env python3

# Author: Byrd

# Created Time: Thu 10 May 2018 11:20:39 AM CST

#!/usr/bin/env python3

sum = 0

for i in range(1, 11):

sum += 1.0 / i

print("{:3d} {:6.4f}".format(i , sum))

说明：

for循环,i取值范围为1-10,不包括11；
sum += 1.0 / i表示 sum = sum + 1.0 / i；
3d表示如果位数不足3位,则用空格补齐;
6.4f表示如果小数后面位数不足4位,则用0补齐,如果整个小数不足 6 位（小数点占 1 位）, 整数前用空格补足；
format格式化,i采用3d的格式.而sum采用6.4f的格式； SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

演示：

$ cat 1.py 
#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 11:20:39 AM CST
print("{:3d} {:8.4f}".format(13 , 1.33))
$ python3 1.py 
 13   1.3300

$ cat 1.py

#!/usr/bin/env python3

# Author: Byrd

# Created Time: Thu 10 May 2018 11:20:39 AM CST

print("{:3d} {:8.4f}".format(13 , 1.33))

$ python3 1.py

13 1.3300

SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

Pracitces 2:SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

$ cat 2.py #!/usr/bin/env python3 # Author: Byrd # Created Time: Thu 10 May 2018 11:49:30 AM CST import math a = int(input("Enter value of a: ")) b = int(input("Enter value of b: ")) c = int(input("Enter value of c: ")) d = b * b - 4 * a * c if d < 0: print("ROOTS are imaginary") else: root1 = (-b + math.sqrt(d)) / (2 * a) root2 = (-b - math.sqrt(d)) / (2 * a) print("Root 1 = ", root1) print("Root 2 = ", root2)

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$ cat 2.py
#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 11:49:30 AM CST
import math
a = int(input("Enter value of a: "))
b = int(input("Enter value of b: "))
c = int(input("Enter value of c: "))
d = b * b - 4 * a * c
if d < 0:
    print("ROOTS are imaginary")
else:
    root1 = (-b + math.sqrt(d)) / (2 * a)
    root2 = (-b - math.sqrt(d)) / (2 * a)
    print("Root 1 = ", root1)
    print("Root 2 = ", root2)

说明：SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/
导入math模块；
a、b、c等待用户输入,且转换为整数;
d的值为运算结果；(1 * 1 - 4 * 5 * 0) = 1
如果d的值小于0,则打印ROOTS are imaginary；
否则
root1= (-1 + 1.0) / (2 * 5)
root2= (-1 - 1.0) / (2 * 5) = -2 / 10 = 0.2 SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

演示：

$ python3 2.py Enter value of a: 5 Enter value of b: 1 Enter value of c: 0 Root 1 = 0.0 Root 2 = -0.2

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$ python3 2.py
Enter value of a: 5
Enter value of b: 1
Enter value of c: 0
Root 1 =  0.0
Root 2 =  -0.2

SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

Practices 3: SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

$ cat 3.py #!/usr/bin/env python3 # Author: Byrd # Created Time: Thu 10 May 2018 01:55:34 PM CST basic_salary = 1500 bonus_rate = 200 commision_rate = 0.02 numberofcamera = int(input("Enter the number of inputs sold: ")) price = float(input("Enter the total prices: ")) bonus = (bonus_rate * numberofcamera) commision = (commision_rate * numberofcamera * price) print("Bonus = {:6.2f}".format(bonus)) print("Commision = {:6.2f}".format(commision)) print("Gross salary = {:6.2f}".format(basic_salary + bonus + commision))

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$ cat 3.py
#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 01:55:34 PM CST
basic_salary = 1500
bonus_rate = 200
commision_rate = 0.02
numberofcamera = int(input("Enter the number of inputs sold: "))
price = float(input("Enter the total prices: "))
bonus = (bonus_rate * numberofcamera)
commision = (commision_rate * numberofcamera * price)
print("Bonus        = {:6.2f}".format(bonus))
print("Commision    = {:6.2f}".format(commision))
print("Gross salary = {:6.2f}".format(basic_salary + bonus + commision))

说明：SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/
numberofcamera = 3
price = 2
bonus = 200 * 3
commision = 0.02 * 3 * 2
打印bonus,保留2位2小数,整个字符长度为6位
同上 SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

演示：

$ python3 3.py Enter the number of inputs sold: 3 Enter the total prices: 2 Bonus = 600.00 Commision = 0.12 Gross salary = 2100.12

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$ python3 3.py
Enter the number of inputs sold: 3
Enter the total prices: 2
Bonus        = 600.00
Commision    =   0.12
Gross salary = 2100.12

SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

Practices 4:SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

#!/usr/bin/env python3 # Author: Byrd # Created Time: Thu 10 May 2018 03:22:13 PM CST import math R = int(input("Please input the number: ")) PI = math.pi circlearea = PI * R * R print('{:4.10f}'.format(circlearea))

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#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 03:22:13 PM CST
import math
R = int(input("Please input the number: "))
PI = math.pi
circlearea = PI * R * R
print('{:4.10f}'.format(circlearea))

SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/
说明：SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/
import math #导入模块
R = 3
PI = 3.141592653589793 #π
circlearea = 3.141592653589793 * 3 * 3 #圆的面积公式 πR²
{:4.10f} 表示整个长度为4位以上,如果长度不够整数前用空格补齐(包括小数点),取小数点后10位 SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

演示：

$ python3 4.py Please input the number: 3 28.2743338823

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$ python3 4.py
Please input the number: 3
28.2743338823

SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

Practices 5:SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

#!/usr/bin/env python3 # Author: Byrd # Created Time: Thu 10 May 2018 04:34:53 PM CST a, b = 0, 1 while b < 100: print(b) a, b = b, a + b

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#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 04:34:53 PM CST
a, b = 0, 1
while b < 100:
print(b)
a, b = b, a + b

说明：SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/
a=0 b=1
当b小于100的时候,循环进行
第一次循环 a = 0 b = 1 且打印b
赋值 a = b = 1
第二次循环 a = 1 b = 1
第N次循环 a = 34 b = 55
第N+1次循环 a = 89 b = 144 不符合条件,跳出循环SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/
print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

演示：

$ python3 5.py 1 1 2 3 5 8 13 21 34 55 89

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$ python3 5.py
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89

SourceByrd's Weblog-https://note.t4x.org/basic/python-exercise-test/

Practices 6:

$ cat 6.py #!/usr/bin/env python3 # Author: Byrd # Created Time: Thu 10 May 2018 04:34:53 PM CST a, b = 0, 1 while b < 100: print(b, end =' ') a, b = b, a + b

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$ cat 6.py
#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 04:34:53 PM CST
a, b = 0, 1
while b < 100:
print(b, end =' ')
a, b = b, a + b

说明：
print(b, end =' ') 将默认换行符换成空格

演示：

$ python3 6.py 1 1 2 3 5 8 13 21 34 55 89 [www@Practice code]$

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$ python3 6.py
1 1 2 3 5 8 13 21 34 55 89 [www@Practice code]$

Practices 7:

$ cat 7.py #!/usr/bin/env python3 # Author: Byrd # Created Time: Thu 10 May 2018 04:34:53 PM CST a, b = 0, 1 while b < 100: print(b, end =' ') a, b = b, a + b print()

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$ cat 7.py
#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 10 May 2018 04:34:53 PM CST
a, b = 0, 1
while b < 100:
    print(b, end =' ')
    a, b = b, a + b
print()

说明：

演示：

$ python3 7.py 1 1 2 3 5 8 13 21 34 55 89

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$ python3 7.py
1 1 2 3 5 8 13 21 34 55 89

Pracitces 8:

$ cat 8.py #!/usr/bin/env python3 # Author: Byrd # Created Time: Thu 17 May 2018 03:26:43 PM CST x = float(input("Enter the value of x: ")) n = term = num = 1 result = 1.0 while n <= 100: term *= x / n result += term n += 1 if term < 0.0001: break print("No of Times= {} and Sum= {}".format(n, result))

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$ cat 8.py
#!/usr/bin/env python3
# Author: Byrd
# Created Time: Thu 17 May 2018 03:26:43 PM CST
x = float(input("Enter the value of x: "))
n = term = num = 1
result = 1.0
while n <= 100:
    term *= x / n
    result += term
    n += 1
    if term < 0.0001:
        break
print("No of Times= {} and Sum= {}".format(n, result))

说明：
x = 2.0
n = term = num = 1
n小于或者等于100 循环成立
term = term * x / n = 1 * 2.0 = 2.0
result = result + term = 1.0 + 2.0 =3.0
n = n + 1

演示：

$ python3 8.py Enter the value of x: 2 No of Times= 12 and Sum= 7.389046015712681

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$ python3 8.py
Enter the value of x: 2
No of Times= 12 and Sum= 7.389046015712681

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