def speed(v) :
    if v < 7.9 :
        print("你没能上升到新的境界")
    elif v < 11.2 :
        print("你上升到了新的境界: 绕地球做圆周运动")
    elif v < 16.7 :
        print("你上升到了新的境界: 跑出地球")
    elif v < 525 :
        print("你上升到了新的境界: 跑出太阳系")
    else :
        print("你上升到了新的境界: 跑出银河系")

speed(1.14514)
speed(11.4514)
speed(114.514)
speed(1145.14)

def eotest(x) :
    if x % 2 :
        print("odd")
    else :
        print("even")
eotest(1)
eotest(2)

print([x for x in range(100, 1000) if not x % 17])

import math
def function(a, b, c) :
    if a == 0 :
        print("这是个一次方程，愤怒。自己算去吧！")
        return
    delta = b * b - 4 * a * c
    if delta < 0 :
        print("没有实数解哦")
    elif delta == 0 :
        x = (-b) / (2 * a)
        print("解是:", x)
    else :
        x1 = (-b + math.sqrt(delta)) / (2 * a)
        x2 = (-b - math.sqrt(delta)) / (2 * a)
        print("解是:" , x1 , "和" , x2)
function(11, 45, 14)
function(114, 5, 14)
function(1, 2, 1)
function(0, 114, 514)

dic = {'book': ['python', 'djang', 'data'], 'author': 'laoqi', 'publisher': 'phei'}
dic2 = {}
for (key, value) in dic.items() :
    if isinstance(value, list) :
        dic2[tuple(value)] = key
    else :
        dic2[value] = key
print(dic2)

import csv
from numpy import array
csvfile = open("hw2-7.csv", "r")
csvreader = csv.reader(csvfile)
dic = {}
data = [i for i in csvreader if len(i) == 14]
mtx = array(data)
namemtx = list(mtx[1:, 0:1])
mtx = map(lambda x: map(float, x), mtx[1:, 1:])
nummtx = [list(i) for i in mtx]
avg = sum(map(sum, nummtx)) / (len(nummtx) * len(nummtx[0]))  #平均值
cityavg = list(map(lambda x: sum(x) / len(x), nummtx))
for i in range(0, len(cityavg)) :
    if cityavg[i] > avg :
        dic[str(namemtx[i][0])] = cityavg[i]
print(dic) #将高出平均值的省市保存到dic中
csvfile.close()

def huiwen(x) :
    st = str(x)
    print(st == st[::-1])
huiwen(11451)
huiwen(11411)

l = [2, 4, -7, 19, -2, -1, 45]
print(list(i for i in l if i > 0))

d = {'python': 89, 'java': 58, 'physics': 65, 'math': 87, 'chinese': 74, 'english': 60}
avg = sum(d.values()) / len(d)
print(dict(i for i in d.items() if i[1] > avg))

print(sum([x * x for x in range(1, 101)]))

import math
def isprime(x) :
    if x == 1:
        return False
    for i in range(2, math.ceil(math.sqrt(x))):
        if not x % i :
            return False
    return True

print([i for i in range(1, 101) if isprime(i)])

import math
def lcm(x, y) :
    return x * y / math.gcd(x, y)
def cm(x, y, range) :
    l = lcm(x, y)
    p = l
    ls = []
    while p < range :
        ls.append(p)
        p = p + l
    return ls

print(cm(3, 10, 100))

import re
lec = 'Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battle-field of that war. We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that nation might live. It is altogether fitting and proper that we should do this. But, in a larger sense, we can not dedicate -- we can not consecrate -- we can not hallow -- this ground. The brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. The world will little note, nor long remember what we say here, but it can never forget what they did here. It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us -- that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion -- that we here highly resolve that these dead shall not have died in vain -- that this nation, under God, shall have a new birth of freedom -- and that government of the people, by the people, for the people, shall not perish from the earth.'
low = lec.lower()
r = re.compile(r'[a-z]+')
wordlist = r.findall(low)
dic = {}
for word in wordlist :
    if word in dic.keys() :
        dic[word] += 1
    else :
        dic[word] = 1
print(dic)

import math

def avg(x : list) :
    return sum(x) / len(x)
def std_error(x : list) :
    return math.sqrt((sum([i * i for i in x]) - len(x) * avg(x) * avg(x)) / (len(x) - 1))

test = {'烤啊嘶': 0, '古明地恋': 100, '来姐': 100, '路人': 60}
print(sorted(test.items(), key = lambda x: x[1]))
print(avg(test.values()))
print(std_error(test.values()))

def fact(x : int) :
    if x == 1 :
        return x
    return fact(x - 1) * x

print(fact(5))
print(fact(10))

def ari_seq(x, y, d) :
    '''
    :param x: 首项
    :param y: 尾项
    :param d: 公差
    '''
    n = (y - x) / d + 1
    return (x + y) * n / 2

print(ari_seq(1, 100, 1))

>>> lst = ["a", "b"]
>>> lst[3]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range

def listget(x : list, n : int) :
    try :
        return x[n]
    except IndexError:
        print("下标越界了，你是baka吗? 列表长度{0}, 试图访问{1}".format(len(x), n))
        return None

l = ["我永远", "喜欢", "古明地恋"]
print(listget(l, 2))
listget(l, 114514)