Easier way to find if string is a number in Python 3
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Asking the user for input until they give a valid response
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How to convert string equation to number in javascript?
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How do I verify that a string only contains letters, numbers, underscores and dashes?
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Finding all numbers in a string
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Javascript string/integer comparisons
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Fastest way to find if a given number is prime
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How can I check if a string represents an int, without using try/except?
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How to convert strings into integers in Python?
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How do you use: isalnum, isdigit, isupper to test each character of a string?
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Convenient string manipulation
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How do I check that a number is float or integer?
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Check whether an input string contains a number in javascript
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How to manually parse a floating point number from a string
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How to add two strings as if they were numbers?
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What's the canonical way to check for type in Python?
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How do I test if a variable is a number in Bash?
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Check if a string contains an element from a list (of strings)