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@ -8,6 +8,7 @@ contributors:
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translators:
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translators:
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- ["Michael Yeh", "https://github.com/hinet60613"]
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- ["Michael Yeh", "https://github.com/hinet60613"]
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filename: learnpython.py
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filename: learnpython.py
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lang: zh-tw
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---
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---
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Python是在1990年代早期由Guido Van Rossum創建的。它是現在最流行的程式語言之一。我愛上Python是因為他極為清晰的語法,甚至可以說它就是可執行的虛擬碼。
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Python是在1990年代早期由Guido Van Rossum創建的。它是現在最流行的程式語言之一。我愛上Python是因為他極為清晰的語法,甚至可以說它就是可執行的虛擬碼。
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@ -142,115 +143,115 @@ None # => None
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"etc" is None # => False
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"etc" is None # => False
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None is None # => True
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None is None # => True
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# The 'is' operator tests for object identity. This isn't
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# 'is' 運算元是用來識別物件的。對原始型別來說或許沒什麼用,
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# very useful when dealing with primitive values, but is
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# 但對物件來說是很有用的。
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# very useful when dealing with objects.
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# Any object can be used in a Boolean context.
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# 任何物件都可以被當作布林值使用
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# The following values are considered falsey:
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# 以下的值會被視為是False :
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# - None
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# - 無(None)
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# - zero of any numeric type (e.g., 0, 0L, 0.0, 0j)
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# - 任何型別的零 (例如: 0, 0L, 0.0, 0j)
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# - empty sequences (e.g., '', (), [])
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# - 空序列 (例如: '', (), [])
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# - empty containers (e.g., {}, set())
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# - 空容器 (例如: {}, set())
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# - instances of user-defined classes meeting certain conditions
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# - 自定義型別的實體,且滿足某些條件
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# see: https://docs.python.org/2/reference/datamodel.html#object.__nonzero__
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# 請參考文件: https://docs.python.org/2/reference/datamodel.html#object.__nonzero__
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#
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#
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# All other values are truthy (using the bool() function on them returns True).
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# 其餘的值都會被視為True (用bool()函式讓他們回傳布林值).
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bool(0) # => False
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bool(0) # => False
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bool("") # => False
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bool("") # => False
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####################################################
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####################################################
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## 2. Variables and Collections
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## 2. 變數與集合
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####################################################
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####################################################
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# Python has a print statement
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# Python的輸出很方便
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print "I'm Python. Nice to meet you!" # => I'm Python. Nice to meet you!
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print "I'm Python. Nice to meet you!" # => I'm Python. Nice to meet you!
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# Simple way to get input data from console
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# 從命令列獲得值也很方便
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input_string_var = raw_input("Enter some data: ") # Returns the data as a string
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input_string_var = raw_input("Enter some data: ") # 資料會被視為字串存進變數
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input_var = input("Enter some data: ") # Evaluates the data as python code
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input_var = input("Enter some data: ") # 輸入的資料會被當作Python程式碼執行
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# Warning: Caution is recommended for input() method usage
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# 注意: 請謹慎使用input()函式
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# Note: In python 3, input() is deprecated and raw_input() is renamed to input()
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# 註: 在Python 3中,input()已被棄用,raw_input()已被更名為input()
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# No need to declare variables before assigning to them.
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# 使用變數前不需要先宣告
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some_var = 5 # Convention is to use lower_case_with_underscores
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some_var = 5 # 方便好用
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lower_case_with_underscores
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some_var # => 5
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some_var # => 5
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# Accessing a previously unassigned variable is an exception.
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# 存取沒有被賦值的變數會造成例外
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# See Control Flow to learn more about exception handling.
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# 請參考錯誤流程部分做例外處理
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some_other_var # Raises a name error
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some_other_var # 造成 NameError
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# if can be used as an expression
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# if可以當判斷式使用
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# Equivalent of C's '?:' ternary operator
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# 相當於C語言中的二元判斷式
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"yahoo!" if 3 > 2 else 2 # => "yahoo!"
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"yahoo!" if 3 > 2 else 2 # => "yahoo!"
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# Lists store sequences
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# 串列型態可以儲存集合
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li = []
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li = []
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# You can start with a prefilled list
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# 你可以預先填好串列內容
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other_li = [4, 5, 6]
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other_li = [4, 5, 6]
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# Add stuff to the end of a list with append
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# 用append()在串列後新增東西 append
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li.append(1) # li is now [1]
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li.append(1) # 此時 li 內容為 [1]
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li.append(2) # li is now [1, 2]
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li.append(2) # 此時 li 內容為 [1, 2]
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li.append(4) # li is now [1, 2, 4]
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li.append(4) # 此時 li 內容為 [1, 2, 4]
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li.append(3) # li is now [1, 2, 4, 3]
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li.append(3) # 此時 li 內容為 [1, 2, 4, 3]
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# Remove from the end with pop
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# 用pop()移除串列尾端的元素
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li.pop() # => 3 and li is now [1, 2, 4]
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li.pop() # => 3 and li is now [1, 2, 4]
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# Let's put it back
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# 然後再塞回去
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li.append(3) # li is now [1, 2, 4, 3] again.
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li.append(3) # li is now [1, 2, 4, 3] again.
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# Access a list like you would any array
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# 你可以像存取陣列一樣的存取串列
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li[0] # => 1
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li[0] # => 1
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# Assign new values to indexes that have already been initialized with =
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# 用等號 = 給串列中特定索引的元素賦值
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li[0] = 42
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li[0] = 42
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li[0] # => 42
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li[0] # => 42
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li[0] = 1 # Note: setting it back to the original value
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li[0] = 1 # 註: 將其設定回原本的值
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# Look at the last element
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# 用 -1 索引值查看串列最後一個元素
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li[-1] # => 3
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li[-1] # => 3
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# Looking out of bounds is an IndexError
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# 存取超過範圍會產生IndexError
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li[4] # Raises an IndexError
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li[4] # Raises an IndexError
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# You can look at ranges with slice syntax.
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# 你可以用切片語法來存取特定範圍的值
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# (It's a closed/open range for you mathy types.)
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# (相當於數學中的左閉右開區間,即包含最左邊界,但不包含右邊界)
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li[1:3] # => [2, 4]
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li[1:3] # => [2, 4]
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# Omit the beginning
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# 略過開頭元素
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li[2:] # => [4, 3]
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li[2:] # => [4, 3]
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# Omit the end
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# 略過結尾元素
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li[:3] # => [1, 2, 4]
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li[:3] # => [1, 2, 4]
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# Select every second entry
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# 每隔兩個元素取值
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li[::2] # =>[1, 4]
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li[::2] # =>[1, 4]
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# Reverse a copy of the list
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# 串列反轉
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li[::-1] # => [3, 4, 2, 1]
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li[::-1] # => [3, 4, 2, 1]
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# Use any combination of these to make advanced slices
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# 你可以任意組合來達到你想要的效果
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# li[start:end:step]
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# li[開始索引:結束索引:間隔]
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# Remove arbitrary elements from a list with "del"
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# 用 "del" 從串列中移除任意元素
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del li[2] # li is now [1, 2, 3]
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del li[2] # 現在 li 內容為 [1, 2, 3]
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# You can add lists
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# 你可以做串列相加
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li + other_li # => [1, 2, 3, 4, 5, 6]
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li + other_li # => [1, 2, 3, 4, 5, 6]
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# Note: values for li and for other_li are not modified.
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# 註: li 及 other_li 沒有被更動
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# Concatenate lists with "extend()"
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# 用 "extend()" 做串列串接
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li.extend(other_li) # Now li is [1, 2, 3, 4, 5, 6]
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li.extend(other_li) # 現在 li 內容為 [1, 2, 3, 4, 5, 6]
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# Remove first occurrence of a value
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# 移除特定值的第一次出現
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li.remove(2) # li is now [1, 3, 4, 5, 6]
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li.remove(2) # 現在 li 內容為 [1, 3, 4, 5, 6]
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li.remove(2) # Raises a ValueError as 2 is not in the list
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li.remove(2) # 2 不在串列中,造成 ValueError
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# Insert an element at a specific index
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# 在特定位置插入值
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li.insert(1, 2) # li is now [1, 2, 3, 4, 5, 6] again
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li.insert(1, 2) # 現在 li 內容再次回復為 [1, 2, 3, 4, 5, 6]
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# Get the index of the first item found
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# 取得特定值在串列中第一次出現的位置
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li.index(2) # => 1
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li.index(2) # => 1
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li.index(7) # Raises a ValueError as 7 is not in the list
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li.index(7) # 7 不在串列中,造成 ValueError
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# Check for existence in a list with "in"
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# 用 "in" 檢查特定值是否出現在串列中
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1 in li # => True
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1 in li # => True
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# Examine the length with "len()"
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# 用 "len()" 取得串列長度
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len(li) # => 6
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len(li) # => 6
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