Python super practical tips to improve work efficiency Max

As we all know, Python is famous for its simplicity and ease of use. In the face of complex and trivial repetitive work, sometimes it is necessary to refine some small scripts to handle the repetitive work. Today, Pison Jiang will give you We have compiled ten very practical tips that can be run directly. It is recommended to collect them.

1. We can assign values ​​to multiple variables through lists, as long as the number of list elements corresponds to the number of variables.

In [1]: list = [1, 2, 3]
In [2]: a, b, c = list
In [3]: print(a, b, c)
1 2 3

2. _ in interactive mode represents the output of the previous expression.

In [4]: 2 * 3
Out[4]: 6
In [5]: _
Out[5]: 6

3. Link the elements in the list through the join operation.

In [6]: words = ['I', 'Like', 'Python']
In [7]: ' '.join(words)
Out[7]: 'I Like Python'

4. Reversing a list should be a basic common operation. Here are two common methods to reverse the list through the reverse function or slicing.

In [8]: words = ['I', 'Like', 'Python']
In [9]: words.reverse()
In [10]: words
Out[10]: ['Python', 'Like', 'I']
In [11]: words[::-1]
Out[11]: ['I', 'Like', 'Python']

5. Although computer hardware is now very cheap, it does not mean that we do not need to consider memory usage when writing programs. We can obtain the memory usage of variables through getsizeof of the sys module.

In [12]: import sys
In [13]: value = 100
In [14]: sys.getsizeof(value)
Out[14]: 28

6. Printing a string multiple times is also a commonly used function of a table. It is often used during debugging. It is especially useful for making dividing lines.

In [15]: '#' * 20
Out[15]: '####################'
0x06

7. Change the first letter of the string to uppercase.

In [16]: word = 'python'
In [17]: word.title()
Out[17]: 'Python'

8. Convert two lists with the same number of elements into dictionaries.

In [18]: keys = ["a", "b", "c"]
In [19]: values = [1, 2, 3]
In [20]: dict(zip(keys, values))
Out[20]: {'a': 1, 'b': 2, 'c': 3}

9. Set the return default value of the dictionary, somewhat similar to the map.getOrDefault() function in Java.

In [23]: d = {'a': 1, 'b': 2}
In [24]: d.get('a')
Out[24]: 1
In [25]: d.get('c')
In [26]: d.get('c', 300)
Out[26]: 300

10. Finally, let me share with you the dictionary/set comprehension. This is one of the most useful functions of Python.

In [27]: values = {i : i*i for i in range(5)}
In [28]: values
Out[28]: {0: 0, 1: 1, 2: 4, 3: 9, 4: 16}
In [29]: nums = {i*i for i in range(5)}
In [30]: nums
Out[30]: {0, 1, 4, 9, 16}
In [31]: nums = [i for i in range(5)]
In [32]: nums
Out[32]: [0, 1, 2, 3, 4]

Summary

Today I will share with you some common practical tips in Python, use them quickly. What other tips do you know about Python? You can communicate with everyone in the comment area.

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