=False# => True# 使用布尔逻辑运算符对数字类型的值进行运算时,会把数值强制转换为布尔值进行运算# 但计算结果会返回它们的强制转换前的值# 注意不要把 bool(ints) 与位运算的 "按位与"、"按位或" (&, |) 混淆bool(0)# => Falsebool(4)# => Truebool(-6)# => True0and2# => 0-5or0
x+= 1#Shorthand for x = x + 1#Handle exceptions with a try/except block#Works on Python 2.6 and up:try:#Use "raise" to raise an errorraiseIndexError("This is an index error")exceptIndexError as e:pass#Pass is just a no-op. Usually you would do recovery here.### 4. Functions...
Learn X in Y minutes # Single line comments start with a number symbol.""" Multiline strings can be writtenusing three "s, and are often usedas documentation."""### 1. Primitive Datatypes and Operators### You have numbers3# => 3# Math is what you would expect1+1# => 28-1# =...
Python 是由吉多·范罗苏姆(Guido Van Rossum)在 90 年代早期设计。它是如今最常用的编程语言之一。它的语法简洁且优美,几乎就是可执行的伪代码。
Learn Python in Y minutes Learn Python The Hard Way (2.5 - 2.6) Learn to Program Using Python - Cody Jackson (PDF) Learning Python - Fabrizio Romano, Packt. (Just fill the fields with any values) Lectures on scientific computing with python - J.R. Johansson (2.7) Modeling Creativity: Ca...
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json模块和picle模块都有 dumps、dump、loads、load四种方法,而且用法一样。 不同的是json模块序列化出来的是通用格式,其它编程语言都认识,就是普通的字符串, 而picle模块序列化出来的只有python可以认识,其他编程语言不认识的,表现为乱码 不过picle可以序列化函数,但是其他文件想用该函数,在该文件中需要有该文件的定...
hickory schedule foo.py --every=10minutes 这样，它就可以在后台执行，并按时调度。此外，你还可以...
In [19]: faithful.columns = ['eruptions', 'waiting'] plt.scatter(faithful.eruptions, faithful.waiting) plt.title('Old Faithful Data Scatterplot') plt.xlabel('Length of eruption (minutes)') plt.ylabel('Time between eruptions (minutes)') ...
(10)pow(x, y) x**y 运算后的值(即幂运算)。 (11)round(x [,n]) 返回浮点数x的四舍五入值,如给出n值,则代表舍入到小数点后的位数。 (12)sqrt(x) 返回数字x的平方根。 (13)sum(iterable[,start-0]) 返回序列iterable和可选参数start的总和(要求数据类型一致) ...