Python's built-in type is extremely powerful, habitual, has great promotion of improving programming efficiency. Unfortunately, C is not so cheap.
Third, the built-in type 1, list: list (ie dynamic array, C standard library VECTOR, but can contain different types of elements in one list) A = ["i", "you", "he", "she" ] # Elements can be any type. Shiple: Press to write to write, when the array processing starts with 0, with a negative target, the first element, -1's first element, the first element of LEN-1, List The length of the number of elements, the length of #LIST. The actual method is to call the __len __ (self) method of this object. Create a continuous list l = range (1,5) # 即 L = [1, 2, 3, 4] without the last element L = RANGE (1, 10, 2) # 即 L = [1, 3, 5, 7, 9] List L.Append (var) # Add Element L. Insert (Index, Var) L.POP (VAR) # Returns the last element and removes L.Remove (var) from LIST # Remove the first time the element L.count (var) # This element appears in the list of L.index (var) #, the location of this element, is not allowed to throw the iptend (list) # appended List , Ie merged List to L on L.Sort () # Sort L.Reverse () # 倒 序 t t::: , *, Keyword Del A [1:] # 片段 操作,, for sub-list [ 1, 2] [3, 4] # [1, 2, 3, 4]. With extend () [2] * 4 # is [2, 2, 2, 2] DEL L [1] # Delete Element DEL L [1: 3] # 指 的 的 元 的 的 的 的= L # L1 is the alias of L, which is the same as the pointer address, and the L1 is operated. The function parameter is the L1 = L [:] # l1 is the clone of L, which is another copy. List comprehension [
Key is an Integer or String type, and Value is any type. The key is unique, the dictionary only recognizes the last key value. Dictionary's method D.Get (key, 0) # With DICT [Key], there is no one to return to the default value, 0. [] No, there is no need to throw D.has_key (key) # There is this button to return True, otherwise false d.keys () # 字 字 字 键 键 d D. Values () D.Items () D.Update (DICT2) # Add Merge Dictionary D.PopItem () # get a pair and remove it from the dictionary. It is time to throw a D. CLEAR () # 清 清 Dictionary, Del Dict D.copy () # copy Dictionary D.cmp (DICT1, DICT2) # 比 比 dictionary, (priority is elementary, key size, key value Size) # The first big return 1, the small return -1, the same return 0 Dictionary copy Dict1 = DICT # alias DICT2 = DICT.COPY () # Clone, another copy.
3, TUPLE: Tuan group (ie, a constant array) TUPLE = ('A', 'B', 'C', 'D', 'E') can be extracted with the [],: operator extracting elements with LIST. It is not possible to modify the elements directly. 4, String: String (ie, the character list that cannot be modified) str = "Hello My Friend" string is a whole. It is impossible if you want to directly modify a part of the string. But we can read some part of the string. The extract of the sub-string STR [: 6] string contains judgment operators: IN, NOT IN "He" in Str "She" Not in String module, there are many ways, such as SUBSTRING, [START [, end]]) # 指 指 范围 查 子 子, return the index value, otherwise returns -1 s.rfind (Substring, [START [, END]) #Nound look for S.index (Substring, [Start [, End]] # 同,, just find the ValueError exception s.rindex (Substring, [START [END]]) # 同 上 上 上. (Substring, [START [, END]] # 回Find the number of substrs s.Lowercase () s.capitalize () # 首 大 大 写 S.Lower () # turn lowercase s.upper () # 转 大 写 S.swapcase () # 大小 换 S.Split ( Str, '') # Turn string to List, Split S.Join (List, '') # to connect LIST to String, with space connection to process strings of built-in functions LEN (STR) # string length CMP ("MY) Friend ", STR) # string comparison.
