return result
print(li)
print('插入排序：',insertSort3(li))
print('选择排序：',selectSort(li))
print('冒泡排序：',bubbleSort(li))
que6()
2.调换字典键值
1. 调换元素.\
def que1():
d={1:"one",2:"two"}
方法1 --- 动态赋值
def method1(d):
d = d.copy()
result = {}
for k,v in d.items():
result[v] = k
return result
方法2 --- 生成器
def method2(d):
d = d.copy()
result = {v:k for k,v in d.items()}
return result
方法3 --- 由值寻找键
def method3(d):
d = d.copy()
由键寻找值
def match(dic, b):
return [k for k,v in dic.items() if v == b]
先生成key-None,再赋值
result = {}
result = result.fromkeys(d.values())
for k in result.keys():
result[k] = match(d, k)[0]
return result
方法4 --- 列表转字典 < 直接转换/动态赋值 >
def method4(d):
d = d.copy()
key = d.keys()
val = d.values()
data = list(zip(key, val))
方法4-1
result1 = {}
for i in range(len(data)):
result1[data[i][1]] = data[i][0]
方法4-2
result2 = dict(zip(val, key))
return result1, result2
print('新列表动态赋值方法：{}'.format(method1(d)))
print('生成器方法：{}'.format(method2(d)))
print('由键寻值方法：{}'.format(method3(d)))
print('动态赋值列表转字典方法：{}'.format(method4(d)[0]))
print('直接列表转字典方法：{}'.format(method4(d)[1]))
que1()
3.删除列表中的重复元素
'''
遇到问题没人解答？小编创建了一个Python学习交流QQ群：531509025
寻找有志同道合的小伙伴，互帮互助,群里还有不错的视频学习教程和PDF电子书！
'''
3. 删除重复元素list =[1,2,5,4,1,5,6,8,0,2,5]
a = np.random.randint(-100, 100, size=10)
a = a.tolist()
def method1(a):
a = a.copy()
a = set(a)
return a
def method2(a):
b = a.copy()
c = 0
for i in range(len(a)-1):
if b[i+c] in b[:i+c]+b[i+c+1:]:
b.pop(i+c)
c -= 1
return b
print('集合法：',method1(a))
print('遍历法：',method2(a))
4.输出质数
def prime(end):
prime_list = []
if end <= 1:
print('必须大于1')
else:
prime_list.append(2)
for i in range(2, end+1, 1):
count = 0
if i == 2:
if i%2 != 0:
prime_list.append(2)
else:
for m in range(2, i):
能够整除，则跳出循环
if (i % m) == 0:
print(i, m)
break
否则计数+1
else:
count += 1
判断是否整除完成(0/n)
if count == i - 2:
prime_list.append(i)
print(count, i, m)
return (prime_list)
num = int(input('想输出2到多少？'))
print(prime(num))
5.判断是一年中第几天
def que3():
3.输入某年某月某日，判断这一天是这一年的第几天？：
闰年判断函数
def judge_leap(num):
date = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
(四年一闰 and not百年) or 四百年闰
if (num % 4 == 0 and num % 100 != 0) or num % 400 ==0:
date[1] =29
return date
格式转换
date = (input('请输入一个日期，格式如：“2018.02.12”：'))
date_list = (list(map(int, (date.split('.')))))
遍历计算天数
day = date_list[2]
for i in range(date_list[1]):
day += judge_leap(date_list[0])[i]
print('{}月{}日是{}年的第{}天\n'.format(date_list[1], date_list[2], date_list[0], day))
que3()
6.猜数字
重新猜数字
import random
def judge_num(num, num_random):
if num > num_random:
print('It\'s too big')
return 1
elif num < num_random:
print('It\'s too small')
return 1
else:
print("Congratulation!! That\' right!")
return 0
产生随机数
num_start = int(input('Digital lower limit of guess number:\n'))
num_end = int(input('Digital upper limit of guess number:\n'))
num_random = random.randint(num_start, num_end)
参数初始化
result = 1 # 判断结果
i = 0 # 循环次数
frequency = 3 # 循环限制次数
提示总猜测次数、剩余次数
print('WARNING: You have【{}】 chances you guess '.format(frequency), end = '--&&>>--')
print('【{}】 chances left now:\n'.format(frequency - i +1))
while result and i != frequency:
猜数字
num = int(input('Please guess a int_number:\n'))
result = judge_num(num, num_random)
i += 1
7.进制转换
任意进制转十进制
def other_to_decimal(hex, num):
整型转化为列表，
num_str = str(num)