python3 下载 以及 练习1

Posted 2020-11-19 feiyun8616的作坊 (半个程序员and dba)

下载python：

https://www.python.org/downloads/release/python-365/

 

下载python 社区版（Community

https://www.jetbrains.com/pycharm/download/download-thanks.html?platform=windows&code=PCC

https://blog.csdn.net/chenggong2dm/article/details/9365437

 

1.编程实现9*9 的乘法口诀

# 长方形的99乘法
for i in range(1,10):
for j in range(1,10):
print("%d*%d=%2d" % (i, j, i*j),end=" ")
print("")

2.我国有13亿人口。年增长率位0.8%, 多少年超过40亿

i=1
a=13
while a<40:
a=a*(1.008)
i=i+1
if a >=40:
break
print (i)

3.编程计算一个班100名学生的平均成绩，然后统计高于平均分的人数

count = 5
s = []
for i in range(count):
print(i+1)
name = input(‘name:‘)
score = input(‘score:‘)
t = {}
t[‘name‘] = name
t[‘score‘] = int(score)
s += [t]

#max = 0
#min = 0
all=0
sum = 0
for i in range(count):
sum += s[i][‘score‘]
a = int(sum/count)
print(a)

for i in range(count):

if a < s[i][‘score‘]:
all = all + 1
# if min > s[i][‘score‘]:
# min = i
# sum +=s[i][‘score‘]
#print(‘max:‘ + s[max][‘name‘] + ‘ ‘ + str(s[max][‘score‘]))
#print(‘min:‘ + s[min][‘name‘] + ‘ ‘ + str(s[min][‘score‘]))
print(‘total:‘ + str(all))