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Python convert a string to f-string
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| >>> hello = 'Hello' | |
| >>> world = 'world!' | |
| >>> str = '{hello} {world}' | |
| >>> str.format(**locals()) | |
| # or | |
| >>> str = '{hello.upper()} {world.upper()}' | |
| >>> eval(f'''f"{str}"''') | |
| 'HELLO WORLD!' |
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