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15 个提高效率的 Python 编程技巧

 2 years ago
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每次写 Python 都会忘记该怎么写,最后只能去 Stack Overflow 查?我也一样。时间一长,这让人厌倦。

这 15 个 Python 技巧和窍门,可以帮你提高效率。

1. 交换值

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x,y=1,2
print(x,y)
x,y=y,x
print(x,y)

2. 字符串列表合并为一个字符串

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sentence_list = ["my","name","is","George"]
sentence_string =" ".join(sentence_list)
print(sentence_string)

3. 将字符串拆分为子字符串列表

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sentence_string ="my name is George"
sentence_string.split()
print(sentence_string)

4. 通过数字填充初始化列表

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[0]*1000# List of1000zeros 
[8.2]*1000# List of10008.2's

5. 字典合并

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x= {'a':1,'b':2}
y= {'b':3,'c':4}
z= {**x, **y}

6. 反转字符串

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name ="George"
name[::-1]

7. 从函数返回多个值

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def get_a_string():
a="George"
b ="is"
c ="cool"
returna, b, c
sentence= get_a_string()
(a, b, c) =sentence

8. 列表解析式

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a= [1,2,3]
b= [num*2for num in a]# Create a new list by multiplying each element in a by 2

9. 遍历字典

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m = {'a':1,'b':2,'c':3,'d':4} 
for key,valueinm.items():
print('{0}: {1}'.format(key,value))

10. 同时遍历列表的索引和值

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m = ['a','b','c','d']
forindex,valueinenumerate(m):
print('{0}: {1}'.format(index,value))

11. 初始化空容器

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a_list= list()
a_dict= dict()
a_map= map()
a_set= set()

12. 删除字符串两端的无用字符

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name =" George "
name_2 ="George///"
name.strip()# prints "George"
name_2.strip("/")# prints "George"

13. 列表中出现最多的元素

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test = [1,2,3,4,2,2,3,1,4,4,4]
print(max(set(test),key= test.count))

14. 检查对象的内存使用情况

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import sys
x =1
print(sys.getsizeof(x))

15. 将 dict 转换为 XML

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fromxml.etree.ElementTreeimportElement
defdict_to_xml(tag, d):
'''
Turn a simple dict of key/value pairs into XML
'''
elem = Element(tag)
forkey, valind.items():
child = Element(key)
child.text = str(val)
elem.append(child)
returnelem

英文原文:

15 Python tips and tricks, so you don’t have to look them up on Stack Overflow


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