[punch in - Blue Bridge Cup] day 4--------- split ('') cannot be used. There is a space after the last number of test cases. Split ()

subject 1： Based on practice Decimal to hexadecimal

Their thinking

Method 1 ： recursive , Short division
Method 2 ：format
Decimal to hexadecimal ：format(n, ‘X’)
Decimal to octal ：format(n, ‘o’)
Hexadecimal to decimal ：int(n, 16)
Octal to decimal ：int(n, 8)

Code

#  Method 1  recursive 
li = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F']
def hexadecimal(a):
    if a > 0:
        hexadecimal(a // 16)
        print(li[a % 16], end='')
a = int(input())
if a == 0:
    print(li[a], end='')
else:
    hexadecimal(a)

#  Method 2 format
a = int(input())
print(format(a, 'X'))

subject 2： Based on practice Hexadecimal to decimal

Their thinking

Method 1 ： loop
Method 2 ：int()

Code

#  Method 1 ： loop 
n = input()
li = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F']
sum = 0
i = 0
for item in n[::-1]:
    sum = sum + (li.index(item) * pow(16, i))
    i+=1
print(sum)


#  Method 2 ：int()
n = input()
print(int(n, 16))

subject 3： Based on practice Hexadecimal to octal

Their thinking

Method 1 ： First convert decimal , Retransfer octal ( Overtime , Ideas ： Convert hex to binary , A hexadecimal number is a 4 Binary of bit , No code )
Method 2 ：int() format()

Code

#  Method 1 ： First convert decimal , Retransfer octal ( Overtime , Ideas ： Convert hex to binary , A hexadecimal number is a 4 Binary of bit )
li = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F']
n = int(input())
ans = []
for i in range(n):
    #  Hexadecimal to decimal 
    num = input()
    sum = 0
    j = 0
    for item in num[::-1]:
        sum = sum + (li.index(item) * pow(16, j))
        j+=1
    #  Decimal to octal 
    ansItem = []
    if sum == 0:
        ans.append(0)
    while sum > 0:
        ansItem.append(str(sum % 8))
        sum = sum // 8
    ans.append(int(''.join(ansItem[::-1])))
for i in range(n):
    print(ans[i])
    
#  Method 2 ：int() format()
n = int(input())
ans = []
for i in range(n):
    num = input()
    ans.append(format(int(num, 16), 'o'))
for i in range(n):
    print(ans[i])

subject 4： Based on practice Sequence sorting

Their thinking

sort、sorted Sort
sort And sorted difference ：
sort Is used in the list The method on the ,sorted You can sort all iterable objects .
list Of sort Method returns an operation on an existing list , No return value , And built-in functions sorted Method returns a new one list, Instead of operating on the basis of the original .(https://www.runoob.com/python/python-func-sorted.html)

Code

n = int(input())
intList = list(map(int, input().split()))
intList.sort()
for i in range(n):
    print(intList[i], end=' ')