# Helene Martin, Garfield High School
# Demonstrates strings

# Strings are lists of characters.  Most things done with a list can be done with a string.
# Strings can't be modified (no append or pop allowed!)

# Anything between quotes is a string
my_string = "Hello"
print(my_string)

# String characters can be indexed
print(my_string[3]) #prints 'l'

# We can slice strings
print(my_string[3:5]) #prints 'lo'

# We can loop over a string
for letter in my_string:
    print(letter)

# We can replace a part of the string
# Note that since strings can't be modified, we have to save the result
new_string = my_string.replace("lo", "macaroni")
print(new_string) # prints Helmacaroni

# Find a substring in a string
print(my_string.find("lo")) # prints 3 (found at index 3)
print(my_string.find("z")) # prints -1 (not found)

print(my_string.lower()) # to lowercase
print(my_string.upper()) # to uppercase

# Test for a certain suffix
if(my_string.endswith("ed")):
    print("Probably a past-tense verb")
else:
    print("Probably not a past-tense verb")

# Can split a string on a particular identifier.
# VERY useful for reading datafiles
my_data = "bobby,1995,10,23,45,10"
data_list = my_data.split(",")
print(data_list)

# We can center the string to make our printouts pretty
print(my_string.center(80)) # centers on an 80-character line