Python Variables

Hello everyone, I am ikanke.

I am learning programming, this journey is very interesting.

I will share some knowledge I learned.

First, let's start with Python variables.

Master the Python variable

In Python, variables are like magical containers for storing value. You can imagine them as small storage boxes with labels, you can store anything in it -numbers, string, list ... everything!

Interestingly, you can name these containers at will (almost). Let's explore how to use these powerful containers in Python.

What is the variable? ?

In short, variables are the name of a storage value. It is like the label on the box you use to store your love. But the key is that you can store any type of value!

Example:

Storage value 120.

<code class="language-python">n = 120
My_lucky_number = 7
print(n + My_lucky_number)  # 输出：127</code>

Storage value 7.
• n Add them up, Python will tell you the result is 127!
• My_lucky_number In Python, you don't need to stick to the same value forever! You can restart the value at any time.
• Example:

Initially, is 23, but we decided to change it to 24.

Then we took it to 2 to get

, and the result was 48. It's simple, right?

<code class="language-python">Fav_num = 23
Fav_num = 24
Total_num = Fav_num * 2
print(Total_num)  # 输出：48</code>

Variable naming rules: Don't violate it!

Fav_num Now, the point is: Although you can almost name the variable at will, there are some rules of Python to keep the code tidy.

Total_num Start with the letters or down the line

You cannot start with a digital variable. Python is very picky about this.

Don't try to do this:

But you can start the following line or letters:

Use letters, numbers, or underline

After the first character, you can mix with letters, numbers or lines. But there must be no space or strange symbol! Keep simplicity.

<code class="language-python">5numbers  ❌ 不行！不能以数字开头。</code>

The following is valid:

<code class="language-python">_numbers ✅ 可以！
myVariable ✅ 也可以！</code>

2. Division of a lowercase

Python distinguishes la between and lowercase, which means that

,

and

are completely different!

<code class="language-python">numbers_5 ✅ 完全没问题。
totalSum123 ✅ 也很好。</code>

The above is some important matters that need to be paid attention to when naming variables in Python.
I hope this article will help you!

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