How Can I Efficiently Embed Variables into Strings in Python?

Putting Variables into Strings: Interpolation Techniques

Inserting variables into strings is essential for dynamic text generation in programming. In Python, there are several methods to achieve this:

1. **f-strings:**
   <pre class="brush:php;toolbar:false">
   num = 40
   plot.savefig(f'hanning{num}.pdf') # uses f-string syntax
   

2. **str.format():**
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   plot.savefig('hanning{0}.pdf'.format(num))
   

3. **String concatenation:**
   <pre class="brush:php;toolbar:false">
   plot.savefig('hanning' + str(num) + '.pdf')
   

4. **Conversion Specifier:**
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   plot.savefig('hanning%s.pdf' % num)
   

5. **Local variable names:**
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   plot.savefig('hanning%(num)s.pdf' % locals())
   

6. **string.Template:**
   <pre class="brush:php;toolbar:false">
   plot.savefig(string.Template('hanning${num}.pdf').substitute(locals()))
   

7. **Looping:**
   <pre class="brush:php;toolbar:false">
   for num in range(1, 101):
       plot.savefig('hanning{}.pdf'.format(num))
   

   Each method has its own advantages and applications. Choosing the appropriate technique depends on factors such as Python version, code readability, and performance requirements.

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