python系列 2 函式

def hello(name):

print('hello' +' ' +  name)
hello('alice')
hello('bob')

import random

def getanswer(answernumber):
if answernumber == 1:
return 'it is a certain'
elif answernumber == 2:
return 'yes'
elif answernumber == 3:
return 'it is decidely so'
elif answernumber == 4:
return 'reply hazy try again '
elif answernumber == 5:
return 'ask again later'
elif answernumber == 6:
return 'concentrate and ask again'
elif answernumber == 7:
return 'my replly is no'
elif answernumber == 8:
return 'out look not so good'
elif answernumber == 9:
return 'very doubtful'
r = random.randint(1, 9)
fortune = getanswer(r)
print(fortune)

建立區域性變數

def spam():

global eggs
eggs = 'spam'
eggs = 'global'
spam()
print(eggs)

import random

secretnumber = random.randint(1, 20)
print('i am thinkinng of a number between 1 and 20')
# ask the player too guess 6 times
for guessestaken in range(1, 7):
print('take a guess')
guess = int(input())
if guess < secretnumber:
print('your guess is too low')
elif guess > secretnumber:
print('your guess is too high')
else:
break # this condition is the coorrect guess
if guess == secretnumber:
print('good job! your guessd my number in' + str(guessestaken) + 'guesses!')
else:
print('nope, the number i was thinking of was' + str(secretnumber))

就列印並返回 3*number + 1

然後編寫乙個程式，讓使用者輸入乙個整數，並不斷對這個數呼叫collatz(),直到函式返回值為1

def collatz(number):

if number % 2 == 0:
return a//2
elif number % 2 !=0:
return  3 * a + 1
try:
a = int(input('please input a number'))
while true:
a = collatz(a)
if a ==  1:
print(a)
break
except valueerror:
print('please input a right int num')

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