diff --git a/README.md b/README.md index cc504d8..37900c5 100644 --- a/README.md +++ b/README.md @@ -13,6 +13,8 @@ ### python_lda.py: 玩点高级的--带你入门Topic模型LDA(小改进+附源码) ### python_sqlalchemy.py: 作为一个Pythoner,不会SQLAlchemy都不好意思跟同行打招呼! + +### python_oneline.py: 几个小例子告诉你, 一行Python代码能干哪些事 ============================================================ ### 您可以fork该项目,并在修改后提交Pull request diff --git a/python_base.py b/python_base.py index 62a989f..4fd2792 100644 --- a/python_base.py +++ b/python_base.py @@ -1273,12 +1273,7 @@ """其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他----其他""" - -#-- 60个字符解决FizzBuzz: - """写一个程序, 打印数字1到100, 3的倍数打印“Fizz”来替换这个数, 5的倍数打印“Buzz”, 既是3又是5的倍数的打印“FizzBuzz”""" - for x in range(101): - print("fizz"[x%3*4::]+"buzz"[x%5*4::] or x) # 解释:最主要用到列表(字符串)的子表 - + #-- Python实现任意深度的赋值 例如a[0] = 'value1'; a[1][2] = 'value2'; a[3][4][5] = 'value3' class MyDict(dict): def __setitem__(self, key, value): # 该函数不做任何改动 这里只是为了输出 diff --git a/python_oneline.py b/python_oneline.py new file mode 100644 index 0000000..50715eb --- /dev/null +++ b/python_oneline.py @@ -0,0 +1,90 @@ +# _*_ coding: utf-8 _*_ + +""" +python_oneline.py by xianhu +""" + + +# 首先来个python之禅 +# python -c "import this" +""" +The Zen of Python, by Tim Peters + +Beautiful is better than ugly. +Explicit is better than implicit. +Simple is better than complex. +Complex is better than complicated. +Flat is better than nested. +Sparse is better than dense. +Readability counts. +Special cases aren't special enough to break the rules. +Although practicality beats purity. +Errors should never pass silently. +Unless explicitly silenced. +In the face of ambiguity, refuse the temptation to guess. +There should be one-- and preferably only one --obvious way to do it. +Although that way may not be obvious at first unless you're Dutch. +Now is better than never. +Although never is often better than *right* now. +If the implementation is hard to explain, it's a bad idea. +If the implementation is easy to explain, it may be a good idea. +Namespaces are one honking great idea -- let's do more of those! +""" + + +# 一行代码启动一个Web服务 +# python -m SimpleHTTPServer 8080 +# python3 -m http.server 8080 + + +# 一行代码实现变量值互换 +a, b = 1, 2; a, b = b, a + + +# 一行代码解决FizzBuzz问题: 打印数字1到100, 3的倍数打印“Fizz”来替换这个数, 5的倍数打印“Buzz”, 既是3又是5的倍数的打印“FizzBuzz” +print(' '.join(["fizz"[x % 3 * 4:]+"buzz"[x % 5 * 4:] or str(x) for x in range(1, 101)])) + + +# 一行代码输出特定字符"Love"拼成的心形 +print('\n'.join([''.join([('Love'[(x-y) % len('Love')] if ((x*0.05)**2+(y*0.1)**2-1)**3-(x*0.05)**2*(y*0.1)**3 <= 0 else ' ') for x in range(-30, 30)]) for y in range(30, -30, -1)])) + + +# 一行代码输出Mandelbrot图像: Mandelbrot图像中的每个位置都对应于公式N=x+y*i中的一个复数 +print('\n'.join([''.join(['*'if abs((lambda a: lambda z, c, n: a(a, z, c, n))(lambda s, z, c, n: z if n == 0 else s(s, z*z+c, c, n-1))(0, 0.02*x+0.05j*y, 40)) < 2 else ' ' for x in range(-80, 20)]) for y in range(-20, 20)])) + + +# 一行代码打印九九乘法表 +print('\n'.join([' '.join(['%s*%s=%-2s' % (y, x, x*y) for y in range(1, x+1)]) for x in range(1, 10)])) + + +# 一行代码计算出1-100之间的素数(两个版本) +print(' '.join([str(item) for item in filter(lambda x: not [x % i for i in range(2, x) if x % i == 0], range(2, 101))])) +print(' '.join([str(item) for item in filter(lambda x: all(map(lambda p: x % p != 0, range(2, x))), range(2, 101))])) + + +# 一行代码输出斐波那契数列 +print([x[0] for x in [(a[i][0], a.append([a[i][1], a[i][0]+a[i][1]])) for a in ([[1, 1]], ) for i in range(30)]]) + + +# 一行代码实现快排算法 +qsort = lambda arr: len(arr) > 1 and qsort(list(filter(lambda x: x <= arr[0], arr[1:]))) + arr[0:1] + qsort(list(filter(lambda x: x > arr[0], arr[1:]))) or arr + + +# 一行代码解决八皇后问题 +[__import__('sys').stdout.write('\n'.join('.' * i + 'Q' + '.' * (8-i-1) for i in vec) + "\n========\n") for vec in __import__('itertools').permutations(range(8)) if 8 == len(set(vec[i]+i for i in range(8))) == len(set(vec[i]-i for i in range(8)))] + + +# 一行代码实现数组的flatten功能: 将多维数组转化为一维 +flatten = lambda x: [y for l in x for y in flatten(l)] if isinstance(x, list) else [x] + + +# 一行代码实现list, 有点类似与上个功能的反功能 +array = lambda x: [x[i:i+3] for i in range(0, len(x), 3)] + + +# 一行代码实现求解2的1000次方的各位数之和 +print(sum(map(int, str(2**1000)))) + + +# 最后推荐一篇文章: [Python One-liner Games](http://arunrocks.com/python-one-liner-games/) +exit()