For this programming challenge, write a function in a .py file which takes 1 string as an argument, finds out the number of words in that string, then returns that number. 

For example, if the program was used on the string "This is a string.", then the function would return 4. 

Assumptions:

• Assume that the string will be assigned to a variable and that it will contain at least 1 word.

• Assume that there will never be 2 or more consecutive spaces in a row within the string.

• Contractions and possessive words with an apostrophe like "it's" or "Brian's" count as 1 word.

• Hyphenated words like "ice-cream" count as 1 word.

• Numbers in the string such as the "007" in "James Bond is 007." count as words

• There will be no double quotes "" within in the string.

Hints for this problem:

1. Use string methods to filter out characters besides numbers, letters, spaces, apostrophes, and hyphens.

2. Count the number of spaces in the filtered string and add 1 to that since the string will always contain at least 1 word.  This will give you the number of words it contains.

You should test your program with many different strings. 

However, the strings that the solution code is being used on are the 3 strings below.

str_1 = "James Bond is 007."
str_2 = "When the moon hits your eye like a big pizza pie, that's amore!"
str_3 = "Anyway, like I was sayin', shrimp is the fruit of the sea. You can barbecue it, boil it, broil it, bake it, \
saute it. Dey's uh, shrimp-kabobs, shrimp creole, shrimp gumbo. Pan fried, deep fried, stir-fried. There's pineapple \
shrimp, lemon shrimp, coconut shrimp, pepper shrimp, shrimp soup, shrimp stew, shrimp salad, shrimp and potatoes, \
shrimp burger, shrimp sandwich. That- that's about it."

So, for your final solution, copy the above into your .py file and print() 3 calls of your function, once for each of the 3 variables above.