python's format function formats strings via {}
>>> a='{0}'.format(123)
>>> a
'123'
If you need to include the {} character in the text, using it this way will result in the error.
>>> a='{123} {0}'.format('123')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: tuple index out of range
It needs to be escaped by {{}}, which is the {} of double
>>> a='{{123}} {0}'.format('123')
>>> a
'{123} 123'
Reference Links.
/3/library/#formatstrings
Here's a look at the three methods of python string concatenation
python string concatenation methods, there are generally the following three:Method 1: directly through the plus (+) operator connectionwebsite=& 39;python& 39;+& 39;tab& 39;+& 39; com& 39;Method 2
There are three general methods for python string concatenation.
Method 1: Direct connection via the plus (+) operator
website = 'python' + 'tab' + '.com'
Method 2: join method
listStr = ['python', 'tab', '.com'] website = ''.join(listStr)
Method 3: Replacement
website = '%s%s%s' % ('python', 'tab', '.com')
Here's a little more about the differences between the three methods
Method 1, the use of simple and direct, but many people online say that this method is inefficient
The reason why it is inefficient to use + for string concatenation in python is that strings are immutable types in python, and using + to concatenate two strings generates a new string, which needs to be reclaimed, and when there are a lot of consecutively concatenated strings (a+b+c+d+e+f+...) When there are many consecutive strings (a+b+c+d+e+f+...), inefficiency is inevitable
Method 2, slightly more complicated to use, but efficient when joining multiple characters, there will only be one memory request. And if you are concatenating a list of characters, this method must be the first choice.
Method 3: string formatting, this method is very commonly used, I also recommend using this method
summarize
The above is a small introduction to how to enter pure {} in python strings, I hope it will help you, if you have any questions please leave me a message, I will reply to you in time. I would also like to thank you very much for your support of my website!