from array import *
from array import *
help(array)
Help on class array in module array: class array(builtins.object) | array(typecode [, initializer]) -> array | | Return a new array whose items are restricted by typecode, and | initialized from the optional initializer value, which must be a list, | string or iterable over elements of the appropriate type. | | Arrays represent basic values and behave very much like lists, except | the type of objects stored in them is constrained. The type is specified | at object creation time by using a type code, which is a single character. | The following type codes are defined: | | Type code C Type Minimum size in bytes | 'b' signed integer 1 | 'B' unsigned integer 1 | 'u' Unicode character 2 (see note) | 'h' signed integer 2 | 'H' unsigned integer 2 | 'i' signed integer 2 | 'I' unsigned integer 2 | 'l' signed integer 4 | 'L' unsigned integer 4 | 'q' signed integer 8 (see note) | 'Q' unsigned integer 8 (see note) | 'f' floating point 4 | 'd' floating point 8 | | NOTE: The 'u' typecode corresponds to Python's unicode character. On | narrow builds this is 2-bytes on wide builds this is 4-bytes. | | NOTE: The 'q' and 'Q' type codes are only available if the platform | C compiler used to build Python supports 'long long', or, on Windows, | '__int64'. | | Methods: | | append() -- append a new item to the end of the array | buffer_info() -- return information giving the current memory info | byteswap() -- byteswap all the items of the array | count() -- return number of occurrences of an object | extend() -- extend array by appending multiple elements from an iterable | fromfile() -- read items from a file object | fromlist() -- append items from the list | frombytes() -- append items from the string | index() -- return index of first occurrence of an object | insert() -- insert a new item into the array at a provided position | pop() -- remove and return item (default last) | remove() -- remove first occurrence of an object | reverse() -- reverse the order of the items in the array | tofile() -- write all items to a file object | tolist() -- return the array converted to an ordinary list | tobytes() -- return the array converted to a string | | Attributes: | | typecode -- the typecode character used to create the array | itemsize -- the length in bytes of one array item | | Methods defined here: | | __add__(self, value, /) | Return self+value. | | __contains__(self, key, /) | Return key in self. | | __copy__(self, /) | Return a copy of the array. | | __deepcopy__(self, unused, /) | Return a copy of the array. | | __delitem__(self, key, /) | Delete self[key]. | | __eq__(self, value, /) | Return self==value. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getitem__(self, key, /) | Return self[key]. | | __gt__(self, value, /) | Return self>value. | | __iadd__(self, value, /) | Implement self+=value. | | __imul__(self, value, /) | Implement self*=value. | | __iter__(self, /) | Implement iter(self). | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __reduce_ex__(self, value, /) | Return state information for pickling. | | __repr__(self, /) | Return repr(self). | | __rmul__(self, value, /) | Return value*self. | | __setitem__(self, key, value, /) | Set self[key] to value. | | __sizeof__(self, /) | Size of the array in memory, in bytes. | | append(self, v, /) | Append new value v to the end of the array. | | buffer_info(self, /) | Return a tuple (address, length) giving the current memory address and the length in items of the buffer used to hold array's contents. | | The length should be multiplied by the itemsize attribute to calculate | the buffer length in bytes. | | byteswap(self, /) | Byteswap all items of the array. | | If the items in the array are not 1, 2, 4, or 8 bytes in size, RuntimeError is | raised. | | count(self, v, /) | Return number of occurrences of v in the array. | | extend(self, bb, /) | Append items to the end of the array. | | frombytes(self, buffer, /) | Appends items from the string, interpreting it as an array of machine values, as if it had been read from a file using the fromfile() method). | | fromfile(self, f, n, /) | Read n objects from the file object f and append them to the end of the array. | | fromlist(self, list, /) | Append items to array from list. | | fromstring(self, buffer, /) | Appends items from the string, interpreting it as an array of machine values, as if it had been read from a file using the fromfile() method). | | This method is deprecated. Use frombytes instead. | | fromunicode(self, ustr, /) | Extends this array with data from the unicode string ustr. | | The array must be a unicode type array; otherwise a ValueError is raised. | Use array.frombytes(ustr.encode(...)) to append Unicode data to an array of | some other type. | | index(self, v, /) | Return index of first occurrence of v in the array. | | insert(self, i, v, /) | Insert a new item v into the array before position i. | | pop(self, i=-1, /) | Return the i-th element and delete it from the array. | | i defaults to -1. | | remove(self, v, /) | Remove the first occurrence of v in the array. | | reverse(self, /) | Reverse the order of the items in the array. | | tobytes(self, /) | Convert the array to an array of machine values and return the bytes representation. | | tofile(self, f, /) | Write all items (as machine values) to the file object f. | | tolist(self, /) | Convert array to an ordinary list with the same items. | | tostring(self, /) | Convert the array to an array of machine values and return the bytes representation. | | This method is deprecated. Use tobytes instead. | | tounicode(self, /) | Extends this array with data from the unicode string ustr. | | Convert the array to a unicode string. The array must be a unicode type array; | otherwise a ValueError is raised. Use array.tobytes().decode() to obtain a | unicode string from an array of some other type. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data descriptors defined here: | | itemsize | the size, in bytes, of one array item | | typecode | the typecode character used to create the array | | ---------------------------------------------------------------------- | Data and other attributes defined here: | | __hash__ = None
variable = array(typecode, [value1, value2, ...]) #create array
variable[index] #get array value
#範例
from array import *
my_array = array('u', ['H', 'a']) #建立陣列
print(my_array)
print(type(my_array))
print(type(my_array.tounicode()))
print("- - - - - - - - - - - - - - ")
print("存取陣列方法一:")
for i in my_array:
print(i)
print("存取陣列方法二:")
for i in range(len(my_array)):
print(my_array[i])
print("- - - - - - - - - - - - - - ")
print(my_array.tounicode())
array('u', 'Ha')
<class 'array.array'>
<class 'str'>
- - - - - - - - - - - - - -
存取陣列方法一:
H
a
存取陣列方法二:
H
a
- - - - - - - - - - - - - -
Ha
#範例
from array import *
my_array = array('i', [1, 2, 3, 4, 5]) #建立陣列
print(type(my_array))
print(my_array.typecode)
print(my_array)
print("存取陣列方法一:")
for i in my_array:
print(i)
print("存取陣列方法二:")
for i in range(len(my_array)):
print(my_array[i])
<class 'array.array'>
i
array('i', [1, 2, 3, 4, 5])
存取陣列方法一:
1
2
3
4
5
存取陣列方法二:
1
2
3
4
5
array中array中輸出該單字variable.insert(index, value)
variable.append(value)
#範例
from array import *
my_array = array('i', [1, 2, 3, 4, 5])
my_array.insert(2, 100)
my_array.append(600)
for i in my_array:
print(i, end=" ")
1 2 100 3 4 5 600
請自行練習array的插入資料方法
variable.remove(value)
variale.pop()
# 範例
from array import *
my_array = array('i', [1, 2, 3, 4, 5])
my_array.pop()
print(my_array)
my_array.remove(3)
print(my_array)
array('i', [1, 2, 3, 4])
array('i', [1, 2, 4])
array如下[1, 4, 6, 2, 4, 3, 2, 4]4的元素, 並印出arrayarray_variable[index] = data
# 範例
from array import *
my_array = array('i', [1, 2, 3, 4, 5])
my_array[2] = 10
print(my_array)
array('i', [1, 2, 10, 4, 5])
python的array¶list的切片python的shadow copysum, max, min...等等array的資料型態例：
輸入：1 2 3 4 5
輸出：
資料型態: <class 'array.array'>
最大值: 5
最小值: 1
平均值: 3.0array輸入：
數組字串1：1 2 3 4 5
數組字串2：6 7 8 9 0
輸出：
array('f', [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 0.0])array例：
輸入：
數組：1 6 2 5 3
輸出：
資料型態: <class 'array.array'>
反向輸出: array('i', [3, 5, 2, 6, 1])
由大到小排序: [6, 5, 3, 2, 1]O(1)O(n)O(n)O(n)