Python學習筆記

程式案例內聯**片。

// 列印資訊

message =
"hello world!"
print
(message)
message =
"hello python crash course world!"
print
(message)

// 輸出結果

hello world！
hello python crash course world！

python始終記錄變數的最新值

// 列印資訊

name =
"hello world!"
print
(name.
title()
)print
(name.
upper()
)print
(name.
lower()
)

// 輸出結果

hello world！
hello world！
hello world！

刪除字串末尾空白rstrip()，刪除字串開頭空白lstrip()，同時剔除字串兩端的空白strip()。刪除只是暫時的，要永久刪除需要將值賦給字串變數。

// 列印資訊

>>>language =
' python '
>>>language.
rstrip()
' python'
>>>language.
lstrip()
'python '
>>>language.
strip()
'python'

str()轉換成字串

// 列印資訊

age =
23message =
+str
(age)
+"rd birthday!"
print
(message)

// 輸出結果

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
print
(bicycles[0]
)print
(bicycles[0]
.title()
)print
(bicycles[-1
])

// 輸出結果

['trek','cannondale','redline','specialized']
trek
trek
specialized

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
bicycles[0]
='cycle'
print
(bicycles)

// 輸出結果

['trek','cannondale','redline','specialized']
['cycle','cannondale','redline','specialized']

3.2.1 在列表末尾新增元素

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
bicycles.
('end'
)print
(bicycles)

// 輸出結果

['trek','cannondale','redline','specialized']
['trek','cannondale','redline','specialized','end']

方法為insert()

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
bicycles.
insert(1
,'insert'
)print
(bicycles)

// 輸出結果

['trek','cannondale','redline','specialized']
['trek','insert','cannondale','redline','specialized']

1. 使用del語句刪除元素

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
del bicycles[0]
print
(bicycles)

// 輸出結果

['trek','cannondale','redline','specialized']
['cannondale','redline','specialized']

pop方法預設刪除最後一位元素，如需指定刪除元素位置，可向該方法內傳遞引數。

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
poped_bicycle = bicycles.
pop(
)print
(bicycles)
print
(poped_bicycle)
poped_bicycle1 = bicycles.
pop(1)
print
(bicycles)
print
(poped_bicycle1)

// 輸出結果

['trek','cannondale','redline','specialized']
['trek','cannondale','redline']
specialized
['trek','redline']
cannondale

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
bicycles.
remove
('trek'
)print
(bicycles)

// 輸出結果

['trek','cannondale','redline','specialized']
['cannondale','redline','specialized']

3.3 組織列表

3.3.1使用方法sort()對列表進行永久性排序

下列操作對列表的內容是永久性的

// 列印資訊

bicycles =
['trek'
,'cannondale'
,'redline'
,'specialized'
]print
(bicycles)
bicycles.
sort()
print
(bicycles)
bicycles.
sort
(reverse=true)
print
(bicycles)

// 輸出結果

['trek','cannondale','redline','specialized']
['specialized','redline','cannondale','trek']
['trek','cannondale','redline','specialized']

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