Day4作业-列表相关
2018-07-21 本文已影响84人
周zau1
1.已知⼀个列表，求列表中⼼元素。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
num = len(A)
n = int(num / 2)
print(A[n])
5
Process finished with exit code 0
2.已知⼀个列表，求所有元素和。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
num = 0
for x in A:
num += x
print(num)
45
Process finished with exit code 0
3.已知⼀个列表，输出所有奇数下标元素。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
num = len(A)
print(A[1:num:2])
[2, 4, 6, 8]
Process finished with exit code 0
4.已知⼀个列表，输出所有元素中，值为奇数的。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
for x in A:
if x % 2 != 0:
print(x)
continue
1
3
5
7
9
Process finished with exit code 0
5.已知⼀个列表，将所有元素乘⼆。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
B = []
for x in A:
x *= 2
B.append(x)
print(B)
[2, 4, 6, 8, 10, 12, 14, 16, 18]
Process finished with exit code 0
6.已知⼀个列表，将所有元素加到第⼀个元素中。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
B = [A[0]] + A
A[0] = B
print(A)
[[1, 1, 2, 3, 4, 5, 6, 7, 8, 9], 2, 3, 4, 5, 6, 7, 8, 9]
Process finished with exit code 0
7.已知⼀个列表A，将奇数位置元素存到B列表中，偶数元素存到C列表中。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
B = []
C = []
for x in range(len(A)):
if x % 2 == 0:
B.append(A[x])
else:
C.append(A[x])
print(B ,C)
[1, 3, 5, 7, 9] [2, 4, 6, 8]
Process finished with exit code 0
8.把A列表的前5个元素复制到B列表中。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
B = A[0:5]
print(B)
[1, 2, 3, 4, 5]
Process finished with exit code 0
9.把1----36分别放⼊列表中，计算列表数组对⻆元素之和。6 * 6的列表
sum1 = 0
for x in range(1, 37):
print(x, end=' ')
if x < 10:
print('', end=' ')
if x % 6 == 0:
print('')
sum1 += x
sum2 = sum1 / (6 / 2)
print('对角线和为：' % sum2)
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22 23 24
25 26 27 28 29 30
31 32 33 34 35 36
对角线和为： 222.0
10.有⼀个⻓度是10的列表，列表内有10个不重复的数字，要求按从⼤到⼩排序。
A = [21, 95, 2, 64, 35, 16, 81, 51, 24, 8]
A.sort()
print(A[::-1])
[95, 81, 64, 51, 35, 24, 21, 16, 8, 2]
Process finished with exit code 0
11.有⼀个⻓度是10的列表，要求删除某⼀个位置的元素
A = [21, 95, 2, 64, 35, 16, 81, 51, 24, 8]
n = int(input('请输入需要删除的元素的位置：'))
max1 = len(A)
if n <= max1:
B = A.pop(n - 1)
print('删除的元素为：', B)
else:
print('输入无效')
请输入需要删除的元素的位置：8
删除的元素为： 51
Process finished with exit code 0
12.有⼀个⻓度是10的列表，按递增排列，⽤户输⼊⼀个数，插⼊适当位置。
A = [2, 8, 16, 21, 24, 35, 51, 64, 81, 95]
num = int(input('请输入一个整数：'))
A.append(num)
A.sort()
print(A)
请输入一个整数：8
[2, 8, 8, 16, 21, 24, 35, 51, 64, 81, 95]
Process finished with exit code 0
13.有⼀个⻓度是10的列表，数组内有10个⼈名，要求去掉重复的
names = ['费舍尔', '加索尔', '科比', '奥多姆', '拜纳姆', '费舍尔', '加索尔', '科比', '奥多姆', '拜纳姆']
names1 = list(set(names))
print(names1)
['费舍尔', '奥多姆', '加索尔', '科比', '拜纳姆']
Process finished with exit code 0
14.把A列表的第三到第六位之间的元素删除。
A = [21, 95, 2, 64, 35, 16, 81, 51, 24, 8]
del A[3: 5]
print(A)
[21, 95, 2, 16, 81, 51, 24, 8]
Process finished with exit code 0
15.已知A列表，B列表，定义⼀个列表C，要求C包含A,B数组中的数据（⽆重复值）。
A = [1, 2, 3, 4, 5, 6, 7, 8, 9]
B = [21, 95, 2, 64, 35, 16, 81, 51, 24, 8]
C = list(set(A + B))
print(C)
[64, 1, 2, 3, 4, 5, 6, 7, 8, 9, 35, 16, 81, 51, 21, 24, 95]
Process finished with exit code 0
