str2 = "exam"

print(str1.find(str2, 5))

打印的结果是（    ）。

def fact(n):

      if n==0:

         return 1

      else:

         return n*fact(n-1)

num =eval(input("请输入一个整数："))

print(fact(abs(int(num))))

  def showNnumber(numbers):

for n in numbers:

          print(n)

  下面哪些在调用函数时会报错（    ）

   try:

      #语句块1

   except  IndexError as i:

      # 语句块2

d = {"数学":101, "语文":202, "英语":203, "物理":204, "生物":206}

d["化学"] = 205

d["数学"] = 201

del d["生物"]

for key in d:

        print("{}:{}".format(d[key], key))

try:

    number = int(input("请输入数字："))

    print("number:",number)

    print("=======hello======")

except Exception as e:

    print("出现异常信息 ")

else:

    print("没有异常")

finally:

    print("finally")

print("end")

def chanageInt(n2):

     n2 = n2+1

     print("changeInt: n2= ",n2)

n1 = 2

chanageInt(n1)

print("number:",n1)

def test(x, y, z=1, **p):

    sumT = 0

    if len(p) > 0:

        for i in p.values():

            sumT = sumT - i

    return x+y+z+sumT

print(test(1, 2))   

print(test(1, 2, z=3, k=4))

for n in range(50, 1, -1):

    if n%2 == 0:

        continue

    for i in range(3, int(n**0.5)+1, 2):

        if n%i == 0:

            break

    else:

        print(n)

        break

import string

def caesar(s, k):

    lower = 'abcdefghijklmnopqrstuvwxyz'

    upper = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

    result = ''

    for alph in s:

        pos1 = lower.find(alph)

        pos2 = upper.find(alph)

        if pos1 != -1 or pos2 != -1:

            result += lower[(pos1+k)%len(lower)] if pos1 != -1 else upper[(pos2+k)%len(upper)]

        else:

            result += alph

return result

s = 'I love Python'

print(caesar(s,2))