Wednesday, March 14, 2018

From Python chapter 2 code solution

Here is my answer for book:

从Python开始学编程


Chapter 2, Appendix A, Exam.

https://book.douban.com/subject/26919485/
..

from itertools import repeat

def gen():
int_rate = [0.01, 0.02, 0.03, 0.035, 0.05]
for r in int_rate:
yield r
for r in repeat(0.05):
yield r

def num_year_pay() :
house_price = 500000
year_pay = 30000
year_n = 1
rem = house_price

print(year_pay)

for r in gen():
if rem <=0:
break
print(r)
rem = rem * (1 + r) - year_pay
year_n = year_n + 1
print(rem)

return year_n

if __name__ == "__main__":
print("Number of years to pay loan: ", num_year_pay())

Number of years to pay loan: 31

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