List¶

In Python, a basic type of "array" is called "list" The elements in a list can be a mixture of numbers and text strings, enclosed by [ ]

Python內建的陣列叫做list 一個list當中可以同時包含數字與字串的元素，用 [ ] 包起來

Example of a "list" in python:¶

In [2]:

A=[1,2,3,'RH','pressure']
print(A)

[1, 2, 3, 'RH', 'pressure']

In [3]:

print(A[0])    # show only the first element [Note the subscript starts from "0"!!]

In [4]:

print(A[2:4])  # show part of the list ("a:b" means "from a to b-1")

[3, 'RH']

In [5]:

print(len(A))  # checking the size of the list (how many elements it contains)

List的合併、增加元素

-- array.append 在最後面加入元素或list

-- array.insert 在指定的位置插入新元素

-- array.extend 在list最後面加入另一個list(且合併為同一個list)

-- + 把兩個List接在一起

In [6]:

A.append(123) #在最後面加入元素或list
print(A)

[1, 2, 3, 'RH', 'pressure', 123]

In [7]:

A.insert(2,'xx') #在指定的位置插入新元素
print(A)

[1, 2, 'xx', 3, 'RH', 'pressure', 123]

In [8]:

A.extend([50, 60])  #在list最後面加入另一個list(且合併為同一個list)
print(A)

[1, 2, 'xx', 3, 'RH', 'pressure', 123, 50, 60]

In [9]:

A.append([201,'rain'])  # compare append and extend for adding a list to a list
print(A)

[1, 2, 'xx', 3, 'RH', 'pressure', 123, 50, 60, [201, 'rain']]

In [10]:

A=A+[124,125]       # similar to extend, 在list最後面加入另一個list(且合併為同一個list)
print(A)

[1, 2, 'xx', 3, 'RH', 'pressure', 123, 50, 60, [201, 'rain'], 124, 125]

In [11]:

print(A[9])  # when an element is a list, it also contains multiple elements
print(A[9][1])

[201, 'rain']
rain

In [12]:

for x in range(5):
    print(x,A[x])

In [ ]: