winetricks. You will be able to create application specific configurations and use different WINE prefixes as well as being able to install Windows
dllsand components to add functionality to your applications.
Dictionariesaren't the Incredible Hulk, but they are supercharged in what they can do. In other languages, dictionaries are referred to as hashes, associative arrays, and associative lists. It's probably best to think of them as associative lists because that's exactly what they are. Dictionaries are lists that associate two values with one another. To think of it in terms of an actual dictionary, they associate a word, or
keywith a definition, or
value. They function sort of like a list with custom indexes.
forloops have a defined length based on the data set that they are iterating over.
forloops are used to access and modify each element in a list. To do this, they temporarily represent each element as a new variable used only within the loop.
forloops have a slightly different structure than
whileloops do. They begin with the word
for, which is followed by the temporary variable being created for the loop. Then there is the keyword
inspecifying the set of data being used, followed by the data set itself and, ultimately, a colon.
range()that either takes a single number and behaves like a list of numbers going from zero until the number before the one specified or takes two numbers separated by a comma and acts like a slice starting at the first number and listing all numbers until the number before the last one.
whileloop repeats the same block of code while a condition is true. When that condition becomes false, the loop will break, and the regular flow of code will resume.
whileloop is similar to what you encountered in the last guide with
if. A while loop begins with the word
whilefollowed by parenthesis containing the condition of the loop and a colon. The following lines are indented and will execute in the loop.
# Import time for sleep import time # While loop while(True): print("looping...") time.sleep(2)What happened? Rather, what is happening? If you haven't figured out how to stop it yet, just press
whileloop will run indefinitely as long as the condition that it is given remains
True. The loop above was given
Trueas its condition, which will never not be true.
# blkid /dev/xvda1: UUID="b4f59ae4-f5c8-49c2-94cf-103e10eef407" TYPE="xfs" /dev/xvda2: UUID="zcwKzx-w2EM-NH4E-wQW3-7QTu-62JZ-s6Ok0j" TYPE="LVM2_member" /dev/sr0: UUID="2016-10-19-18-32-06-00" LABEL="RHEL-7.3 Server.x86_64" TYPE="iso9660" PTTYPE="dos" /dev/mapper/rhel-root: UUID="ea637699-1d70-49ef-9a0a-54bc87d1e571" TYPE="xfs" /dev/mapper/rhel-swap: UUID="617ccf82-602c-472d-bff6-484d95530293" TYPE="swap"Read more ...
ifstatement is the structure for a program to pose these questions and evaluate whether or not they are true.
ifstatements can check multiple conditions and provide multiple responses. They can be used to divert code down one path or another and control the overall flow of a program. They can also be used as a gating mechanism to determine whether certain blocks of code run. Have you ever gotten a message telling you that you needed to log in to continue? That was the result of
ifhas a very simple structure. The word,
if, is followed by a set of parenthesis containing a statement that needs to be evaluated for truthfulness and a colon. The following line is indented and contains the action to be performed if the statement is true. There can be multiple actions following
ifas long as they are all indented.
if (5 ** 2 >= 25): print("It's true!") print("If is awesome!")You can resume the normal flow of the program following
ifby returning to unindented lines of code.
Falsecalled a Boolean? There hasn't been a guide on them because Booleans are actually that simple. However, there are symbols called Boolean Operators that are used to evaluate whether a statement is true or false. They compare statements and return either true or false. It sounds simple, and in a way it is, but it can get more complex when more comparisons get added.
and. You can use
andto test in one statement
andanother statement are both true.
is_it_true = (3 * 4 > 10) and (5 + 5 >= 10) print(is_it_true)The code prints out
3 * 4 > 10and
5 + 5 >= 10are true.
/etc/gdm/custom.confwhile replacing keyword "linuxconfig" with a username of your autologin user:
AutomaticLogin=linuxconfig AutomaticLoginEnable=TrueRead more ...