labels, 307–308
languages, high-level, 3
len() function, 98
lists with, 131
tuples, 118
less than operator, 59
less than or equal to operator, 59
levels, adding, 415–416
lifetime attribute, Message class, 429
line-continuation character, 20
lines
blank, 14
new, suppressing, 27–28
reading characters from, 203–204
reading into lists, 204–205
lists
append() function, 136
concatenating, 132
creating, 130
defined, 129
deleting slices from, 134
elements, deleting, 133–134
High Scores program example, 134–135
indexing, 131
len() function with, 131
methods for, 138
mutable, 132
new list slice, 133
in operator with, 131
reading lines into, 204–205
remove() function, 137
reverse() function, 138
shared references, 144–147
slicing, 131
sort() function, 137
livewires modules, 338–339
load_images() function, 344–345, 431
loading
music, 391
sound, 388–389
load_music() function, 431
load_sound() function, 388–389, 431
logical errors, 42–43
logical operators
and, 81–82
not, 81
or, 83
Longevity program example, 316–317
looping
music, 392
sound, 390
loops
infinite, 69–71
for loops, 92–94
Loopy String program example, 93
while, 67–69, 92
Loopy String program example, 93
Losing Battle program, 70–71
lower() method, 40–41