# 刷题继续

### Question 81:

By using list comprehension, please write a program to print the list after removing numbers which are divisible by 5 and 7 in [12,24,35,70,88,120,155].

#### 解法一

```li = [12,24,35,70,88,120,155]
li = [x for x in li if x % 35!=0]
print(li)```

### Question 82:

By using list comprehension, please write a program to print the list after removing the 0th, 2nd, 4th,6th numbers in [12,24,35,70,88,120,155].

#### 解法一

```li = [12,24,35,70,88,120,155]
li = [li[i] for i in range(len(li)) if i%2 != 0]
print(li)```

#### 解法二

```li  =  [12,24,35,70,88,120,155]
li  =  [x  for  (i,x)  in  enumerate(li)  if  i%2!=0]
print(li)```

### Question 83:

By using list comprehension, please write a program to print the list after removing the 2nd - 4th numbers in [12,24,35,70,88,120,155].

#### 解法一

```li = [12,24,35,70,88,120,155]
li = [x for (i,x) in enumerate(li) if i<3 or 4<i]
print(li)```

### Question 84:

By using list comprehension, please write a program generate a 3*5*8 3D array whose each element is 0.

#### 解法一

```array = [[ [0 for col in range(8)] for col in range(5)] for row in range(3)]
print(array)```

### Question 85:

By using list comprehension, please write a program to print the list after removing the 0th,4th,5th numbers in [12,24,35,70,88,120,155].

#### 解法一

```li = [12,24,35,70,88,120,155]
li = [li[i] for i in range(len(li)) if i not in (0,4,5)]
print(li)```

### Question 86:

By using list comprehension, please write a program to print the list after removing the value 24 in [12,24,35,24,88,120,155].

#### 解法一

```li = [12,24,35,24,88,120,155]
li.remove(24)
# this will remove only the first occurrence of 24
print(li)```

#### 解法二

```li = [12,24,35,24,88,120,155]
li = [x for x in li if x!=24]  # Delete all 24
print(li)```

### Question 87:

With two given lists [1,3,6,78,35,55] and [12,24,35,24,88,120,155], write a program to make a list whose elements are intersection of the above given lists.

#### 解法一

```set1=set([1,3,6,78,35,55])
set2=set([12,24,35,24,88,120,155])
result = set1.intersection(set2)
print(result)```

#### 解法二

```set1=set([1,3,6,78,35,55])
set2=set([12,24,35,24,88,120,155])
result = set1 & set2
print(result)```

### Question 88:

With a given list [12,24,35,24,88,120,155,88,120,155], write a program to print this list after removing all duplicate values with original order reserved.

#### 解法一

```li=[12,24,35,24,88,120,155,88,120,155]
result = set(li)  #> Python 3.6 Set keep the order  test
print(result)    ```

#### 解法二

```def removeDuplicate( li ):
seen = {}
for item in li:
if item not in seen:
seen[item] = True
yield item
li = [12, 24, 35, 24, 88, 120, 155, 88, 120, 155]
ans = list(removeDuplicate(li))
print(ans)```

#### 解法三

```li = [12,24,35,24,88,120,155,88,120,155]
for i in li:
if li.count(i) > 1:
li.remove(i)
print(li)```

### Question 89:

Define a class Person and its two child classes: Male and Female. All classes have a method "getGender" which can print "Male" for Male class and "Female" for Female class.

#### 解法一

```class  Person(object):
def  getGender(  self  ):
return  "Unknown"
class  Male(  Person  ):
def  getGender(  self  ):
return  "Male"
class  Female(  Person  ):
def  getGender(  self  ):
return  "Female"
# Test
aMale  =  Male()
aFemale=  Female()
print(aMale.getGender())
print  (aFemale.getGender())```

### Question 90:

Please write a program which count and print the numbers of each character in a string input by console.*Example: If the following string is given as input to the program:*

`abcdefgabc`

Then, the output of the program should be:

```a,2
c,2
b,2
e,1
d,1
g,1
f,1```

#### 解法一

```s=input()
dic = {word:s.count(word) for word in s}
for k, v in dic.items():
print(f"{k},{v}")```

#### 解法二

```s = input()
for letter in range(ord('a'),ord('z')+1):    # ord() gets the ascii value of a char
letter = chr(letter)                     # chr() gets the char of an ascii value
cnt = s.count(letter)
if cnt > 0:
print("{},{}".format(letter,cnt))```

# 源代码下载

• raw_input()在Python3中是input()
• print需要加括号
• fstring可以换成.format(),或者%s，%d

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