# Description: Count the total number of digits in a string using Python. # would be to use a loop. We set a count variable initially to zero, then # use a for loop to examine each character in the ...

Strings, numbers (integers and floats alike), tuples, and built-in singleton objects (True, False, and None) are all common types to use as keys. A given key is unique to a given dictionary ...

where digits[i] is the string representation of the number i from above. Note how to get 10 or larger numbers, we use string concatenation on each digit, so we don't need a million copies of '+all([]) ...