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@@ -5,6 +5,7 @@
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1. 让代码既可以被导入又可以被执行。
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1. 让代码既可以被导入又可以被执行。
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```Python
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```Python
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+
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if __name__ == '__main__':
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if __name__ == '__main__':
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```
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```
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@@ -12,6 +13,7 @@
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2. 用下面的方式判断逻辑“真”或“假”。
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2. 用下面的方式判断逻辑“真”或“假”。
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```Python
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```Python
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+
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if x:
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if x:
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if not x:
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if not x:
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```
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```
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@@ -19,6 +21,7 @@
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**好**的代码:
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**好**的代码:
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```Python
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```Python
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+
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name = 'jackfrued'
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name = 'jackfrued'
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fruits = ['apple', 'orange', 'grape']
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fruits = ['apple', 'orange', 'grape']
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owners = {'1001': '骆昊', '1002': '王大锤'}
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owners = {'1001': '骆昊', '1002': '王大锤'}
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@@ -29,6 +32,7 @@
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**不好**的代码:
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**不好**的代码:
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```Python
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```Python
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+
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name = 'jackfrued'
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name = 'jackfrued'
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fruits = ['apple', 'orange', 'grape']
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fruits = ['apple', 'orange', 'grape']
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owners = {'1001': '骆昊', '1002': '王大锤'}
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owners = {'1001': '骆昊', '1002': '王大锤'}
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@@ -39,6 +43,7 @@
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3. 善于使用in运算符。
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3. 善于使用in运算符。
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```Python
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```Python
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+
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if x in items: # 包含
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if x in items: # 包含
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for x in items: # 迭代
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for x in items: # 迭代
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```
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```
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@@ -46,6 +51,7 @@
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**好**的代码:
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**好**的代码:
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```Python
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```Python
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+
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name = 'Hao LUO'
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name = 'Hao LUO'
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if 'L' in name:
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if 'L' in name:
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print('The name has an L in it.')
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print('The name has an L in it.')
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@@ -54,6 +60,7 @@
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**不好**的代码:
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**不好**的代码:
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```Python
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```Python
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+
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name = 'Hao LUO'
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name = 'Hao LUO'
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if name.find('L') != -1:
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if name.find('L') != -1:
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print('This name has an L in it!')
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print('This name has an L in it!')
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@@ -62,6 +69,7 @@
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4. 不使用临时变量交换两个值。
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4. 不使用临时变量交换两个值。
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```Python
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```Python
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+
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a, b = b, a
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a, b = b, a
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```
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```
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@@ -70,6 +78,7 @@
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**好**的代码:
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**好**的代码:
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```Python
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```Python
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+
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chars = ['j', 'a', 'c', 'k', 'f', 'r', 'u', 'e', 'd']
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chars = ['j', 'a', 'c', 'k', 'f', 'r', 'u', 'e', 'd']
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name = ''.join(chars)
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name = ''.join(chars)
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print(name) # jackfrued
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print(name) # jackfrued
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@@ -78,6 +87,7 @@
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**不好**的代码:
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**不好**的代码:
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```Python
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```Python
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chars = ['j', 'a', 'c', 'k', 'f', 'r', 'u', 'e', 'd']
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chars = ['j', 'a', 'c', 'k', 'f', 'r', 'u', 'e', 'd']
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name = ''
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name = ''
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for char in chars:
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for char in chars:
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@@ -94,6 +104,7 @@
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**好**的代码:
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**好**的代码:
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```Python
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```Python
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+
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d = {'x': '5'}
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d = {'x': '5'}
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try:
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try:
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value = int(d['x'])
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value = int(d['x'])
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@@ -105,6 +116,7 @@
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**不好**的代码:
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**不好**的代码:
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```Python
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```Python
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+
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d = {'x': '5'}
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d = {'x': '5'}
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if 'x' in d and isinstance(d['x'], str) \
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if 'x' in d and isinstance(d['x'], str) \
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and d['x'].isdigit():
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and d['x'].isdigit():
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@@ -119,6 +131,7 @@
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**好**的代码:
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**好**的代码:
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```Python
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```Python
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+
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fruits = ['orange', 'grape', 'pitaya', 'blueberry']
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fruits = ['orange', 'grape', 'pitaya', 'blueberry']
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for index, fruit in enumerate(fruits):
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for index, fruit in enumerate(fruits):
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print(index, ':', fruit)
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print(index, ':', fruit)
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@@ -127,6 +140,7 @@
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**不好**的代码:
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**不好**的代码:
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```Python
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```Python
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+
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fruits = ['orange', 'grape', 'pitaya', 'blueberry']
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fruits = ['orange', 'grape', 'pitaya', 'blueberry']
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index = 0
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index = 0
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for fruit in fruits:
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for fruit in fruits:
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@@ -139,6 +153,7 @@
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**好**的代码:
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**好**的代码:
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```Python
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```Python
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+
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data = [7, 20, 3, 15, 11]
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data = [7, 20, 3, 15, 11]
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result = [num * 3 for num in data if num > 10]
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result = [num * 3 for num in data if num > 10]
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print(result) # [60, 45, 33]
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print(result) # [60, 45, 33]
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@@ -147,6 +162,7 @@
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**不好**的代码:
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**不好**的代码:
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```Python
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```Python
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+
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data = [7, 20, 3, 15, 11]
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data = [7, 20, 3, 15, 11]
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result = []
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result = []
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for i in data:
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for i in data:
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@@ -160,6 +176,7 @@
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**好**的代码:
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**好**的代码:
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```Python
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```Python
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+
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keys = ['1001', '1002', '1003']
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keys = ['1001', '1002', '1003']
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values = ['骆昊', '王大锤', '白元芳']
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values = ['骆昊', '王大锤', '白元芳']
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d = dict(zip(keys, values))
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d = dict(zip(keys, values))
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@@ -169,6 +186,7 @@
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**不好**的代码:
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**不好**的代码:
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```Python
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```Python
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+
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keys = ['1001', '1002', '1003']
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keys = ['1001', '1002', '1003']
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values = ['骆昊', '王大锤', '白元芳']
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values = ['骆昊', '王大锤', '白元芳']
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d = {}
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d = {}
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