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              Python 世界的開端:四則運算

              編者按:本文基于Python2.x,與Python3.x存在差異。時間倉促未能及時更新,請觀看時注意分辨。我們將盡快更新。

              用Python計算

              一提到計算機,當然現在更多人把她叫做電腦,這兩個詞都是指computer。不管什么,只要提到她,普遍都會想到她能夠比較快地做加減乘除,甚至乘方開方等。乃至于,有的人在口語中區分不開計算機和計算器。

              那么,做為零基礎學習這,也就從計算小學數學題目開始吧。因為從這里開始,數學的基礎知識列為肯定過關了。

              復習

              還是先來重溫一下偉大時刻,打印hello world.

              打開電腦,讓python idle運行起來,然后輸入:

              >>> print 'Hello, World'
              Hello, World

              細心的看官,是否注意到,我在這里用的是單引號,上次用的是雙引號。兩者效果一樣,也就是在這種情況下,單引號和雙引號是一樣的效果,一定要是成對出現的,不能一半是單引號,另外一半是雙引號。

              四則運算

              按照下面要求,在ide中運行,看看得到的結果和用小學數學知識運算之后得到的結果是否一致

              >>> 2+5
              7
              >>> 5-2
              3
              >>> 10/2
              5
              >>> 5*2
              10
              >>> 10/5+1
              3
              >>> 2*3-4
              2

              上面的運算中,分別涉及到了四個運算符號:加(+)、減(-)、乘(*)、除(/)

              另外,我相信看官已經發現了一個重要的公理:

              在計算機中,四則運算和小學數學中學習過的四則運算規則是一樣的

              要不說人是高等動物呢,自己發明的東西,一定要繼承自己已經掌握的知識,別跟自己的歷史過不去。偉大的科學家們,在當初設計計算機的時候就想到列為現在學習的需要了,一定不能讓后世子孫再學新的運算規則,就用小學數學里面的好了。感謝那些科學家先驅者,澤被后世。

              下面計算三個算術題,看看結果是什么

              • 4 + 2
              • 4.0 + 2
              • 4.0 + 2.0

              看官可能憤怒了,這么簡單的題目,就不要勞駕計算機了,太浪費了。

              別著急,還是要在ide中運算一下,然后看看結果,有沒有不一樣?要仔細觀察哦。

              >>> 4+2
              6
              >>> 4.0+2
              6.0
              >>> 4.0+2.0
              6.0

              不一樣的地方是:第一個式子結果是6,后面兩個是6.0。

              現在我們就要引入兩個數據類型:整數和浮點數

              對這兩個的定義,不用死記硬背,google一下。記住愛因斯坦說的那句話:書上有的我都不記憶(是這么的說?好像是,大概意思,反正我也不記憶)。后半句他沒說,我補充一下:忘了就google。

              定義1:類似4、-2、129486655、-988654、0這樣形式的數,稱之為整數
              定義2:類似4.0、-2.0、2344.123、3.1415926這樣形式的數,稱之為浮點數

              比較好理解,整數,就是小學學過的整數;浮點數,就是小數。如果整數寫成小數形式,比如4寫成4.0,也就變成了浮點數。

              愛學習,就要有探索精神。看官在網上google一下整數,會發現還有另外一個詞:長整數(型)。顧名思義,就是比較長的整數啦。在有的語言中,把這個做為單獨一類區分開,但是,在python中,我們不用管這個了。只要是整數,就只是整數,不用區分長短(以前版本區分),因為區分沒有什么意思,而且跟小學學過的數學知識不協調。

              還有一個問題,需要向看官交代一下,眼前可能用不到,但是會總有一些人用這個來忽悠你,當他忽悠你的時候,下面的知識就用到了。

              整數溢出問題

              對于其它語言,整數溢出是必須正視的,但是,在python里面,看官就無憂愁了,原因就是python為我們解決了這個問題。

              ok!看官可以在IDE中實驗一下大整數相乘。

              >>> 123456789870987654321122343445567678890098876*1233455667789990099876543332387665443345566
              152278477193527562870044352587576277277562328362032444339019158937017801601677976183816L

              看官是幸運的,python解憂愁,所以,選擇學習python就是珍惜光陰了。

              上面計算結果的數字最后有一個L,就表示這個數是一個長整數,不過,看官不用管這點,反正是python為我們搞定了。

              在結束本節之前,有兩個符號需要看官牢記(不記住也沒關系,可以隨時google,只不過記住后使用更方便)

              • 整數,用int表示,來自單詞:integer
              • 浮點數,用float表示,就是單詞:float

              可以用一個命令:type(object)來檢測一個數是什么類型。

              >>> type(4)
              <type 'int'> #4是int,整數
              >>> type(5.0)
              <type 'float'> #5.0是float,浮點數
              type(988776544222112233445566778899887766554433221133344455566677788998776543222344556678)
              <type 'long'> #是長整數,也是一個整數

              幾個常見函數

              在這里就提到函數,因為這個東西是經常用到的。什么是函數?如果看官不知道此定義,可以去google。貌似是初二數學講的了。

              有幾個常用的函數,列一下,如果記不住也不要緊,知道有這些就好了,用的時候就google。

              求絕對值

              >>> abs(10)
              10
              >>> abs(-10)
              10
              >>> abs(-1.2)
              1.2

              四舍五入

              >>> round(1.234)
              1.0
              >>> round(1.234,2)
              1.23

              >>> #如果不清楚這個函數的用法,可以使用下面方法看幫助信息
              >>> help(round)

              Help on built-in function round in module __builtin__:

              round(…)
              round(number[, ndigits]) -> floating point number

              Round a number to a given precision in decimal digits (default 0 digits).
              This always returns a floating point number. Precision may be negative.

              冪函數

              >>> pow(2,3) #2的3次方
              8

              math模塊(對于模塊可能還有點陌生,不過不要緊,先按照下面代碼實驗一下,慢慢就理解了)

              >>> import math #引入math模塊
              >>> math.floor(32.8) #取整,不是四舍五入
              32.0
              >>> math.sqrt(4) #開平方
              2.0

              總結

              • python里的加減乘除按照小學數學規則執行
              • 不用擔心大整數問題,python會自動處理
              • type(object)是一個有用的東西

              ————

              本文完,如果你想繼續學習,可以點擊下面的鏈接,繼續看:

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