Python Template
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Overview
Python version 2.4 introduced the concept of Python Template to create a simplified syntax that uses string formatted operators to derive an output. Python template class is a way of building pre formatted outputs or acts as a starting point of a new result. This article helps one to understand Python template class, Its implementation and the ways to overcome template error.
Python Template Class
In Python, the template class is used for creating simplified syntax to specify an output. The format of the template uses $ symbol followed by placeholders names and valid Identifiers. The placeholder name surrounded by braces allows it to add more alphanumeric letters without the presence of intervening spaces.
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How Template Work in Python
- The template class first uses a string as a template. A placeholder variable name is used within the string preceding with a $ symbol . The dollar symbol here depicts the presence of a placeholder. To write $ itself in the code, $$ is used.
- substitute() method is used to substitute value into the template using a dictionary. It is ensured that the key is in the dictionary and matches the placeholder name. The template is hence returned with all the values rather than the placeholder.
- We follow the convention of naming the placeholder variable name as the variable naming in Python.
Substitution Roles
- A substitution placeholder is named using $identifierthat maps a mapping key of identifier.
- The $ followed by the first non-identifier character terminates the specification of placeholder.
- $$ is replaced with a single $ and is considered an escape.
Implementation of Template
To implement a template, write the following code:
Output:
Explanation:
x in the code is replaced by Abhipsa
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Python Template Data Output Program
Lets write a code to see the implementation of Python Template data as an output program.
Output:
Python Template Errors
In Python, following are the two types of errors:
- Key Error: When the template is deprived of the value for a placeholder it shows No Placeholder Match.
- Value Error: When the placeholder starts with an invalid character, it shows Bad Placeholder.
Handling Error
- In Python, the template provides a safe_substitute() method that gives back a string to handle the above mentioned errors.
- It leaves the placeholders as it is if it finds that the data is missing. The placeholders are returned if any error prevails. For better understanding, let's take an example:
Output:
Here, the $symbol still prevails.
Conclusion
- Python Template Class is used to simplify an existing syntax to specify an output.
- It used a $ symbol followed by placeholder name.
- There are mostly two types of Template error: Key error and Value error.
- The safe_substitute() method is used for handling Python template error.
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