Python学习 —— 阶段综合练习一

Python 阶段综合练习一

  综合之前的函数、数据结构、流程控制等,做以下实例练习:(建议先不要看代码,自己先试着写;代码仅供参考,有多种实现方法)

 

  1. 定义 is_Even 函数,传一 int 参数,判断是否是偶数,return True;不是,return False

1 '''is_Even'''
2 def is_Even(i):
3     if(i%2==0):
4         return True
5     else:
6         return False
7 print(is_Even(0),is_Even(1),is_Even(1))
is_Even

 

  2. 定义 is_Int 函数,传一 float 参数,判断是否是整数(如1.0 即整数),return True;不是,return False

1 '''is_Int'''
2 def is_Int(f):
3     if(f%1==0):
4         return True
5     else:
6         return False
7 print(is_Int(0),is_Int(1.0),is_Int(1.1))
is_Int'

 

  3. 定义 digital_sum 函数,传一 int 参数,return 其所有位数的数字相加的和;如:1234 返回 10(1+2+3+4); 900 返回 9 (9+0+0)

1 '''digital_sum'''
2 def digital_sum(i):
3     sum = 0
4     while(i/10>1):
5         sum += i%10            
6         i = int(i/10)
7     sum += i
8     return sum
9 print(digital_sum(23423),digital_sum(900),digital_sum(0))
digital_sum 1
1 def digital_sum(i):
2     i = str(i)
3     sum = 0
4     for d in i:
5         sum += int(d)
6     return sum
7 print(digital_sum(23423),digital_sum(900),digital_sum(0))
digital_sum 2

 

   4. 定义 factorial 函数,传一 int 参数,return 其所有位数数字相乘的积;如:1234 返回 24 (1*2*3*4); 909 返回 0 (9*0*9)

1 '''factorial'''
2 def factorial(i):
3     result = 1
4     while(i/10>1):
5         result *= i%10            
6         i = int(i/10)
7     result *= i
8     return result
9 print(factorial(1234),factorial(909),factorial(0))
factorial 1
1 '''factorial'''
2 def factorial(i):
3     i = str(i)
4     result = 1
5     for d in i:
6         result *= int(d)
7     return result
8 print(factorial(1234),factorial(909),factorial(0))
factorial 2

 

  5. 定义 is_prime 函数,传一 int 参数,判断是否是质数(仅可被1或自己整除),若是,return True;不是,return False; 如:1 返回 True;2 返回 True;4 返回 False;13 返回 True

    规定 0 不是质数,返回 False

 1 '''is_prime'''
 2 def is_prime(i):
 3     result = True
 4     for d in range(2,i):
 5         if(i%d==0):
 6             result = False
 7             break
 8     if(i==0):
 9         result = False
10     return result        
11 print(is_prime(1),is_prime(2),is_prime(3),is_prime(4),is_prime(13),is_prime(197),is_prime(201),is_prime(0))
is_prime

 

  6. 定义 reverse 函数,传一 str 参数,将所有字符串字符倒置并 return 该字符串;如:"abcd" return "dcba" 

   备注:list.reverse() 及 list[::-1] 可表示 list 倒置

1 '''reverse'''
2 def reverse(s):
3     l = list(s)
4     new_l = []
5     for i in range(len(l)-1,-1,-1):
6         new_l.append(l[i])
7     return     "".join(new_l)
8 print(reverse("ab cd"),reverse(""))
reverse 1
'''reverse'''
def reverse(s):
    l = list(s)
    l.reverse()        # l = l[::-1]
    return     "".join(l)
print(reverse("ab cd"),reverse(""))
reverse 2

 

  7. 定义 anti_vowel 函数,传一 str 参数,将字符串中所有的元音(a e i o u) 去除(注意大小写),并return;

   如:"Apple is red."  return  "ppl is rd."

   备注:对于list,for item in list_name 即可遍历list,可以不用下标的方式,参见下方的两种方式(之后的例子也列出了两种方式)

1 '''anti_vowel 1'''
2 def anti_vowel(s):
3     l = list(s)
4     new_l = []
5     for i in range(len(l)):
6         if (l[i] not in {'a','e','i','o','u','A','E','I','O','U'}):
7             new_l.append(l[i])
8     return "".join(new_l)
9 print(anti_vowel("Apple is red."))
anti_vowel 1
1 '''anti_vowel 2'''
2 def anti_vowel(s):
3     l = list(s)
4     new_l = []
5     for letter in l:
6         if (letter not in {'a','e','i','o','u','A','E','I','O','U'}):
7             new_l.append(letter)
8     return "".join(new_l)
9 print(anti_vowel("Apple is red."))
anti_vowel 2

 

  8. 定义 scrabble_score 函数,传一 str 参数。预设一组词典(见下方引用),根据词典中字母对应的数值,将传入参数的每个字母数值相加

  (非字母不加,注意大小写转换);如:"Word !"  分别对应取 "w": 4 , "o": 1, "r": 1,"d": 2 , 相加为 4+1+1+2 = 8  return 该值

score = {"a": 1, "c": 3, "b": 3, "e": 1, "d": 2, "g": 2, "f": 4, "i": 1, "h": 4, "k": 5, "j": 8, "m": 3, "l": 1, "o": 1, "n": 1, "q": 10, "p": 3, "s": 1, "r": 1, "u": 1, "t": 1, "w": 4, "v": 4, "y": 4, "x": 8, "z": 10}

 1 '''scrabble_score 1'''
 2 def scrabble_score(s):
 3     score = {"a": 1, "c": 3, "b": 3, "e": 1, "d": 2, "g": 2, "f": 4, "i": 1, "h": 4, "k": 5, "j": 8, "m": 3, "l": 1, "o": 1, "n": 1, "q": 10, "p": 3, "s": 1, "r": 1, "u": 1, "t": 1, "w": 4, "v": 4, "y": 4, "x": 8, "z": 10}
 4     l = list(s)
 5     sum = 0
 6     for i in range(len(l)):
 7         letter = l[i].lower()
 8         if letter in score.keys():
 9             sum += score[letter]
10     return sum
11 print(scrabble_score("Word !"),scrabble_score("Hello World~!"))
scrabble_score 1
 1 '''scrabble_score 2'''
 2 def scrabble_score(s):
 3     score = {"a": 1, "c": 3, "b": 3, "e": 1, "d": 2, "g": 2, "f": 4, "i": 1, "h": 4, "k": 5, "j": 8, "m": 3, "l": 1, "o": 1, "n": 1, "q": 10, "p": 3, "s": 1, "r": 1, "u": 1, "t": 1, "w": 4, "v": 4, "y": 4, "x": 8, "z": 10}
 4     l = list(s)
 5     sum = 0
 6     for letter in l:
 7         letter = letter.lower()
 8         if letter in score.keys():
 9             sum += score[letter]
10     return sum
11 print(scrabble_score("Word !"),scrabble_score("Hello World~!"))
scrabble_score 2

 

  9. 定义 censor 函数,传两个 str 参数:s, h;若 s 字符串中的单词包含 h(全小写)时(不区分大小写,暂时仅考虑空格分隔的单词),

   将其隐藏,每个隐藏的字母显示为 *;该方法为不完善的隐藏字符方法,如隐藏字符后有标点,则仍会显示。(若需完善,可用正则表达式,后续学习)

     如:censor("Fuck U fuck ... ","fuck")  会 return 字符串为 "**** U **** ... "  ;

       censor("My qq is: 1000100, pls add my QQ","qq")  会 return 字符串为 "My ** is: 1000100, pls add my **"

     备注: str.split(" ") 可根据 " " 分隔字符串并返回为list; 字符串相乘,如 "*"*5 可输出 "*****"

 1 '''censor 1'''
 2 def censor(s,h):
 3     l = s.split(" ")
 4     new_l = []
 5     for i in range(len(l)):
 6         word_l = l[i].lower()
 7         if word_l==h:
 8             new_l.append("*"*len(h))
 9         else:
10             new_l.append(l[i])
11     return " ".join(new_l)
12 print(censor("Fuck U fuck ... ","fuck"))
13 print(censor("My qq is: 1000100, pls add my QQ","qq"))
censor 1
 1 '''censor 2'''
 2 def censor(s,h):
 3     l = s.split(" ")
 4     new_l = []
 5     for word in l:
 6         if word.lower()==h:
 7             new_l.append("*"*len(h))
 8         else:
 9             new_l.append(word)
10     return " ".join(new_l)
11 print(censor("Fuck U fuck ... ","fuck"))
12 print(censor("My qq is: 1000100, pls add my QQ","qq"))
censor 2

 

  10. 定义 count_i 函数,传两个参数 l, item:l 为一 list,item 为任意类型元素;return l 中包含 i 的个数 ;

    如: count_i([1,2,3,4,2,1,3,1.0,"1"],1)         会 return 3    (1.0 也可算入;"1" 不可算入)

       count_i(["b","a","ab","a","","A"], "a")     会 return 2 

       count_i([["a"],"a"], ["a"])  会 return 1;  count_i([["a"],"a"], ["a "])    会 return 0

 1 '''count_item 1'''
 2 def count_item(l,item):
 3     count = 0
 4     for i in range(len(l)):
 5         if(l[i]==item):
 6             count += 1
 7     return count
 8 print(count_item([1,2,3,4,2,1,3,1.0,"1"],1))
 9 print(count_item(["b","a","ab","a","","A"], "a"))
10 print(count_item([["a"],"a"], ["a"]),count_item([["a"],"a"], ["a "])) 
count_item 1
 1 '''count_item 2'''
 2 def count_item(l,i):
 3     count = 0
 4     for item in l:
 5         if(item==i):
 6             count += 1
 7     return count
 8 print(count_item([1,2,3,4,2,1,3,1.0,"1"],1))
 9 print(count_item(["b","a","ab","a","","A"], "a"))
10 print(count_item([["a"],"a"], ["a"]),count_item([["a"],"a"], ["a "])) 
count_item 2

 

  11. 定义 purify 函数,传一 list 参数;去除该 list 中所有的奇数(该list中全为int元素)

    如: purify([3,1,5,2,6,1,4])  会 return [2,6,4]

1 '''purify 1'''
2 def purify(l):
3     l_new = []
4     for i in range(len(l)):
5         if(l[i]%2==0):
6             l_new.append(l[i])
7     return l_new
8 print(purify([3,1,5,2,6,1,4]))
purify 1
1 '''purify 2'''
2 def purify(l):
3     l_new = []
4     for i in l:
5         if(i%2==0):
6             l_new.append(i)
7     return l_new
8 print(purify([3,1,5,2,6,1,4]))
purify 2

 

  12. 定义 multiple 函数,传可变参数(该参数全为float),return 所有可变参数相乘的积,无参数则返回 None;

    如:multiple(3,2) return 6;multiple(3.5,2) return 7.0;multiple(3.5,2,3) return 21.0;multiple(3,2,0,3,) return 0;

    备注:函数调用可变个数的参数,在其参数名前加*,如*args,这些参数将被包装进一个元组

 1 '''multiple 1'''
 2 def multiple(*f):
 3     m = 1
 4     if(len(f)==0):
 5         return None
 6     else:
 7         for i in range(len(f)):
 8             m *= f[i]
 9         return m
10 print(multiple(2,3),multiple(3.5,2),multiple(3.5,2,3),multiple())
multiple 1
 1 '''multiple 2'''
 2 def multiple(*f):
 3     m = 1
 4     if(len(f)==0):
 5         return None
 6     else:
 7         for i in f:
 8             m *= i
 9         return m
10 print(multiple(2,3),multiple(3.5,2),multiple(3.5,2,3),multiple())
multiple 2

 

  13. 定义 remove_duplicate 函数,传一参数 list,删除 list 中重复的项;

    如 remove_duplicate([1,2,3,1.0,1,"1"]) return [1,2,3,"1"]

      备注:可用转换为集合set 来去重,但无法保留 list 之前的顺序

1 '''remove_duplicate 1'''
2 def remove_duplicate(l):
3     l_new = []
4     for i in range(len(l)):
5         if l[i] not in l_new:
6             l_new.append(l[i])
7     return l_new
8 print(remove_duplicate([1,2,3,1.0,1,"1"]))
remove_duplicate 1
1 '''remove_duplicate 2'''
2 def remove_duplicate(l):
3     l_new = []
4     for i in l:
5         if i not in l_new:
6             l_new.append(i)
7     return l_new
8 print(remove_duplicate([1,2,3,1.0,1,"1"]))
remove_duplicate 2
1 '''remove_duplicate 3'''
2 def remove_duplicate(l):
3     return list(set(l))
4 print(remove_duplicate([1,2,3,1.0,1,"1"]))
remove_duplicate 3

 

  14. 定义 median 函数,传一参数 list,该 list 中元素均为float或int数值;

    若 list 长度为奇数,return 该list 最中间的数;若 list 长度为偶数,return 该 list 最中间两个数的平均数;若 list 为空,return none

    如 median([3,4,2]) return 3; median([7,2,3,4]) return 3.5  (3+4/2)

      备注:须先对 list 排序,用 sorted(list_name)

 1 '''median'''
 2 def median(l):
 3     l = sorted(l)
 4     l_len = len(l)
 5     if l_len == 0:
 6         return None
 7     elif l_len%2 == 1:
 8         return l[int((l_len-1)/2)]
 9     else:
10         return (l[int((l_len)/2)] + l[int((l_len)/2)-1])/2
11 print(median([]),median([3,4,2]),median([7,2,3,4]))
median

 

posted @ 2015-03-31 11:19  feesland  阅读(3513)  评论(1编辑  收藏  举报