strings

string = "proton neutron"

print(string[:])
# proton neutron
print(string[:2])
# pr
print(string[-2:])
# on
print(string[1:3])
# ro

# reverse
print(string[::-1])
# notorp

# skip every second character
print(string[0:-1:2])
# poo

# built-ins
print(string.capitalize())
# Proton neutron
print(string.title())
# Proton Neutron
print(string.upper())
# PROTON NEUTRON
print(string.lower())
# proton neutron
print(string.center(20, '.'))
# ...proton neutron...

# conditionals
print(string.isdigit())
# False
print(string.islower())
# True
print(string.isupper())
# False

# counting and finding letters in text
print(string.count('p', 0, len(string)))
# 1
print(string.find('t', 1, len(string)))
# 3

# removing whitespace from string
string = "    some text    "

print(string.lstrip())
# 'some text    '
print(string.rstrip())
# '    some text'
print(string.strip())
# 'some text'