1. 編寫函數(shù)佩厚,求1 + 2 + 3 +…N的和
def sum1(n):
sumn = 0
for i in range(1, n+1):
sumn += i
return sumn
print(sum1(6))
2. 編寫一個(gè)函數(shù),求多個(gè)數(shù)中的最大值
def max_num(*nums):
maxnum = 0
for i in nums:
if i>maxnum:
maxnum = i
return maxnum
print(max_num(1, 2, 3))
3. 編寫一個(gè)函數(shù)怀偷,實(shí)現(xiàn)搖骰子的功能宠叼,打印N個(gè)骰子的點(diǎn)數(shù)和
def roll(n):
import random
sum_roll = 0
for i in range(1, n+1):
num = random.randint(1, 6)
print("第%d個(gè)骰子的點(diǎn)數(shù)是:" %i, num)
sum_roll += num
print("總的點(diǎn)數(shù)是:", sum_roll)
roll(3)
4. 編寫一個(gè)函數(shù)鄙皇,交換指定字典的key和value芜赌。
例如: dict1 = {'a': 1, 'b': 2, 'c': 3} --> dict1 = {1: 'a', 2: 'b', 3: 'c'}
def exchange(dict1):
for key in dict1:
value = dict1[key]
del dict1[key]
dict1[value] = key
dict1 = {'a': 1, 'b': 2, 'c': 3}
exchange(dict1)
5. 編寫一個(gè)函數(shù),提取指定字符串中所有的字母伴逸,然后拼接在一起產(chǎn)生一個(gè)新的字符串
例如: 傳入 '12a&bc12d-+' --> 'abcd'
def wordto_str(str1):
for i in str1:
if 'a'<=i<='z' or 'A'<=i<='Z':
print(i, end='')
wordto_str('12assb#%asd')
6. 寫一個(gè)函數(shù)缠沈,求多個(gè)數(shù)的平均值
print()
def average(*nums):
sum_nums = 0
for i in nums:
sum_nums += i
print(sum_nums/len(nums))
average(1, 2, 3, 4, 5)
7. 寫一個(gè)函數(shù),默認(rèn)求10的階乘错蝴,也可以求其他數(shù)字的階乘
def rect(n=10):
sum1 = 1
for i in range(1, n+1):
sum1 *= i
print(sum1)
rect(12)
注意:以下方法不能使用系統(tǒng)提供的方法和函數(shù)洲愤,全部自己寫邏輯**
8. 寫一個(gè)自己的capitalize函數(shù),能夠?qū)⒅付ㄗ址氖鬃帜缸兂纱髮懽帜?/h1>
例如: 'abc' -> 'Abc' '12asd' --> '12asd'
def capitalize(str1):
if 'a'<=str1[0]<='z':
return chr(ord(str1[0])-32)+str1[1:]
# print(chr(ord(str1[0])-32), end='')
# for i in str1[1:]:
# print(i, end='')
# else:
# print(str1)
print(capitalize('abc'))
9. 寫一個(gè)自己的endswith函數(shù)顷锰,判斷一個(gè)字符串是否以指定的字符串結(jié)束
例如: 字符串1:'abc231ab'
字符串2: 'ab'
函數(shù)結(jié)果為: True
字符串1: 'abc231ab'
字符串2: 'ab1'
函數(shù)結(jié)果為: False
print()
def endswith(str1, str2):
length2 = len(str2)
if str1[len(str1)-length2:] == str2: #if str1[-len(str1):] == str2:
print('True')
else:
print('False')
endswith('abc123abc', 'bc')
10. 寫一個(gè)自己的isdigit函數(shù)禽篱,判斷一個(gè)字符串是否是純數(shù)字字符串
例如:
'1234921' 結(jié)果: True
'23函數(shù)' 結(jié)果: False
'a2390' 結(jié)果: False
def isdigital(str1):
for i in str1:
if '0'<=i<='9':
continue
else:
print(False)
break
else:
print(True)
isdigital('1235678')
11. 寫一個(gè)自己的upper函數(shù),將一個(gè)字符串中所有的小寫字母變成大寫字母
例如:
'abH23好rp1' 結(jié)果: 'ABH23好RP1'
def upper(str1):
for i in str1:
if 'a'<=i<='z':
i = chr(ord(i)-32)
print(i, end='')
upper('asq24hio')
12.寫一個(gè)自己的rjust函數(shù)馍惹,創(chuàng)建一個(gè)字符串的長度是指定長度,原字符串在新字符串中右對齊玛界,剩下的部分用指定的字符填充
例如:
原字符:'abc'
寬度: 7
字符: '^'
結(jié)果: '^^^^abc'
原字符: '你好嗎'
寬度: 5
字符: '0'
結(jié)果: '00你好嗎'
def rjust(str1, length, str2):
if len(str1)>=length:
print(str1)
else:
for i in range(length-len(str1)):
print(str2, end='')
print(str1)
rjust('abc', 7, '0')
13. 寫一個(gè)自己的index函數(shù)万矾,統(tǒng)計(jì)指定列表中指定元素的所有下標(biāo),如果列表中沒有指定元素返回 - 1
例如:
列表: [1, 2, 45, 'abc', 1, '你好', 1, 0]
元素: 1
結(jié)果: 0, 4, 6
列表: ['趙云', '郭嘉', '諸葛亮', '曹操', '趙云', '孫權(quán)']
元素: '趙云'
結(jié)果: 0, 4
列表: ['趙云', '郭嘉', '諸葛亮', '曹操', '趙云', '孫權(quán)']
元素: '關(guān)羽'
結(jié)果: -1
def index(list1, elem):
if elem in list1:
for i in range(len(list1)):
if list1[i] == elem:
print(i, end=',')
continue
else:
print(-1)
index([1, 2, 45, 'abc', 1, '你好', 1, 0], 1)
14. 寫一個(gè)自己的len函數(shù)慎框,統(tǒng)計(jì)指定序列中元素的個(gè)數(shù)
例如:
序列:[1, 3, 5, 6]
結(jié)果: 4
序列: (1, 34, 'a', 45, 'bbb')
結(jié)果: 5
序列: 'hello w'
結(jié)果: 7
print()
def len(sequence):
count = 0
for i in sequence:
count += 1
print("有%d個(gè)元素" % count)
len([1, 3, 5, 6])
len((1, 34, 'a', 45, 'bbb'))
len('hello w')
15. 寫一個(gè)自己的max函數(shù)良狈,獲取指定序列中元素的最大值。如果序列是字典笨枯,取字典值的最大值
例如:
序列:[-7, -12, -1, -9]
結(jié)果: -1
序列: 'abcdpzasdz'
結(jié)果: 'z'
序列: {'小明': 90, '張三': 76, '路飛': 30, '小花': 98}
結(jié)果: 98
# def my_max(sequence):
# max_value = 0
# if type(sequence) == list:
# for i in range(len(sequence)):
# for j in range(i+1, len(sequence)):
# if sequence[i] >= sequence[j]:
# max_value = sequence[i]
# print(max_value)
# if type(sequence) == str:
# for i in sequence:
# if ord(i) >= max_value:
# max_value = ord(i)
# print(chr(max_value))
# if type(sequence) == dict: #需完善
# for key in sequence:
# if sequence[key]>=max_value:
# max_value = sequence[key]
# print(max_value)
# my_max([-7, -12, -1, -9])
# my_max('abcdpzasdz')
# my_max({'小明': 90, '張三': 76, '路飛': 30, '小花': 98})
def yt_max(seq):
if isinstance(seq, dict):
list1 = list(seq.values())
else:
list1 = list(seq)
max1 = list1[0]
for index in range(1, len(list1)):
item = list1[index]
if item > max1:
max1 = item
return max1
print(yt_max([1, 34, 5]))
print(yt_max(['abs', 'shd', 'wf']))
print(yt_max({'a': 100, 'b': 20, 'c': 105}))
16. 寫一個(gè)函數(shù)實(shí)現(xiàn)自己in操作薪丁,判斷指定序列中,指定的元素是否存在
例如:
序列: (12, 90, 'abc')
元素: '90'
結(jié)果: False
序列: [12, 90, 'abc']
元素: 90
結(jié)果: True
def if_in(list1, elem):
for i in list1:
if elem == i:
print(True)
else:
print(False)
17. 寫一個(gè)自己的replace函數(shù)馅精,將指定字符串中指定的舊字符串轉(zhuǎn)換成指定的新字符串
例如: 原字符串: 'how are you? and you?'
舊字符串: 'you'
新字符串: 'me'
結(jié)果: 'how are me? and me?'
#方法一
def yt_replace(str1: str, old: str, new: str):
return new.join(str1.split(old))
result = yt_replace('aa yoo how are you? and you?', 'you', 'me')
print(result)
#方法二
def yt_replace(str1: str, old: str, new: str):
strs = []
temp = ''
len_old = len(old)
index = 0
while index < len(str1):
char = str1[index]
if char != old[0]:
temp += char
else:
temp2 = str1[index: index+len_old]
if temp2 == old:
strs.append(temp+new)
temp = ''
index += len_old
continue
else:
temp += char
index += 1
strs.append(temp)
return ''.join(strs)
print(yt_replace('aa yoo how are you? and you?', 'you', 'me'))
print('aa yoo how are you? and you?'.split('you'))
18. 寫四個(gè)函數(shù)严嗜,分別實(shí)現(xiàn)求兩個(gè)列表的交集、并集洲敢、差集漫玄、補(bǔ)集的功能
def inter_set(list1, list2):
list3 = []
for i in list1:
if i in list2:
list3.append(i)
print(set(list3))
def union_set(list1, list2):
list3 = []
for i in list1:
list3.append(i)
for j in list2:
list3.append(j)
print(set(list3))
def sub_set(list1, list2):
list3 = []
for i in list1:
if i not in list2:
list3.append(i)
print(set(list3))
def comple_set(list1, list2):
for i in list1:
if i in list2:
continue
else:
print(list1,"不在",list2,"中")
else:
print(list1, "在", list2, "中的補(bǔ)集是:",end='')
for i in list1:
list2.remove(i)
print(list2)