Python
Python is an easy-to-use, versatile programming language that is an excellent choice for both beginners and industry experts.
Unlike C, Python is an interpreted language, so you don't need to compile the program separately. Instead, the program is run in the Python interpreter.
The code that displays the message "hello, world" written in C is represented in Python as follows:
print("hello, world")
Notice that there are no semicolons and no libraries required. In Python, it is possible to implement relatively simple codes that are more complex in C language.
Variable declaration is simplified in Python. For example, in C, a variable can be defined as int counter = 0; is announced as In Python, it is not required to declare the type of the variable: counter = 0.In Python, it is not necessary to specify the data types, the interpreter can determine it based on the value of the variable. The following data types are commonly used in Python:
- float
- int
- str
- Types long and double like C do not exist in Python. Python decides for itself which data type to use for large and small numbers.
range
- list
- tuple
- dict
- set
- Each of these data types can be implemented in C, but Python has the ability to implement them in a simpler way.
Conditional operators
When using conditional operators in Python, parentheses - () are optional.
Python uses
indentation instead of {}.
else if is used in C, Python uses elif instead.
If, elif and else operators are followed by a colon :
in C || The logical operator
from cs50 import get_int x = get_int("x ni kiriting: ") y = get_int("y ni kiriting: ") if x y: print("x soni y sonidan katta") else: print("x soni y soniga teng")is replaced by or in Python.
Python uses str instead of char, which allows you to work with a single character or string.
from cs50 import get_string s = get_string("Ma'lumotlar o'zgartirilishiga rozimisiz? ") if s == "Y" or s == "y": print("Ha.") elif s == "N" or s == "n": print("Yo'q.")
The syntax of iteration operators
(loops)
in Python is very similar to C, but simpler and more understandable.
Using the while loop, we display the message "meow": for loop: Python automatically increments the value of in here. This approach modularizes the code. List we can store many values in one variable. We can refer to the elements of lists through the index. append method adds a new value to the list. To search for a value in a list in Python, you can use a loop or use a shorter method: in operator checks whether the given value exists in the list. Dictionary are key-value pairs that speed up the search process. people[name] retrieves the corresponding value from the dictionary. In Python, command line arguments can be used using the sys library: argv - contains a list of arguments, the first element of which is the file name. We use certain exit codes (exit status) to indicate the state in which the program ended: sys.exit() returns an exit code (for example, 0 means that the program completed successfully). This article uses CS50x 2024 source.
print("hello, world")
We can further simplify the above code by using
from cs50 import get_int
x = get_int("x ni kiriting: ")
y = get_int("y ni kiriting: ")
if x y:
print("x soni y sonidan katta")
else:
print("x soni y soniga teng")
We can also write the above code as:
from cs50 import get_string
s = get_string("Ma'lumotlar o'zgartirilishiga rozimisiz? ")
if s == "Y" or s == "y":
print("Ha.")
elif s == "N" or s == "n":
print("Yo'q.")
list
Using
i = 0
while i
<p>using the len() method, we determine the length of the listing, that is, the number of elements.<br>
We calculate the sum of the elements of the list consisting of numbers using the sum() method.</p>
<p>A loop can be used to retrieve values from the user:<br>
</p>
<pre class="brush:php;toolbar:false">for i in range(3):
print("meow")
The
def main():
meow(3)
def meow(n):
for i in range(n):
print("meow")
main()
The
Dictionary
scores = [72, 73, 33]
# O'rtacha qiymatni topamiz
average = sum(scores) / len(scores)
print(f"Average: {average}")
The dictionary lookup speed is typically O(1).
Command Line Arguments
from cs50 import get_int
# Foydalanuvchidan qiymatlarni kiritishni so'raymiz
scores = []
for i in range(3):
score = get_int("Score: ")
scores.append(score)
# O'rtacha qiymatni topamiz
average = sum(scores) / len(scores)
print(f"Average: {average}")
We display all arguments:
# Ismlar ro'yxati
names = ["Carter", "David", "John"]
# Foydalanuvchidan ism kiritishni so'raymiz
name = input("Name: ")
# Ro'yxatdan qidiramiz
if name in names:
print("Topildi")
else:
print("Topilmadi"
from cs50 import get_string
people = {
"Carter": "+1-617-495-1000",
"David": "+1-617-495-1000",
"John": "+1-949-468-2750",
}
# Kiritilgan ismni qo'yxatdan qidiramiz
name = get_string("Name: ")
if name in people:
print(f"Telefon raqam: {people[name]}")
else:
print("Topilmadi")
The above is the detailed content of CS- Week 6. For more information, please follow other related articles on the PHP Chinese website!

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