PTA的Python练习题（十五）

第4章-12 求满足条件的斐波那契数

a=eval(input())

b=c=1

d=1

for i in range(a):

    c=b

    b=d

    d=b+c

    if d>a:

        print('{}'.format(d))

        break

第4章-13 求误差小于输入值的e的近似值

a=eval(input())

b=1

count=1

count2=0

for i in range(1,100000):

    b=b*i

    count2=count

    count=count+1/b

    if (count-count2)<a:

        print('{:6f}'.format(count))

        break

第4章-14 统计字符

参考了别人的代码：

---

---

---

s=[]

count=0;letters=0;space=0;digit=0;others=0

while True:

    b=list(input())

    count=count+1

    s.extend(b)

    if len(s)+count>10:

        count=count-1

        break

for c in s:

    if c.isalpha():

        letters+=1

    elif c.isspace():

        space+=1

    elif c.isdigit():

        digit+=1

    else:

        others+=1

print('letter = {}, blank = {}, digit = {}, other = {}'.format(letters,space+count,digit,others))

用列表输入，用count算回车数，如果合计大于10就退出循环，下面调用python自带函数计算