What functions are there in the python standard library?

The Python standard library contains many built-in functions and modules, providing many commonly used functions and tools. The following are some commonly used Python standard library functions:

1. os module: Provides many functions for interacting with the operating system. For example:

os.path.abspath(path): Returns the absolute path of the path.

os.path.dirname(path): Returns the directory name of the path.

os.path.basename(path): Returns the file name of the path.

os.path.exists(path): Check whether the path exists.

os.path.isdir(path): Check whether the path is a directory.

os.path.isfile(path): Check whether the path is a file.

os.path.getsize(path): Get the size of the path file.

os.path.getctime(path): Get the creation time of the path file.

os.path.getmtime(path): Get the modification time of the path file.

2. sys module: Provides many functions for interacting with the Python interpreter. For example:

sys.version: Returns the version information of the Python interpreter.

sys.platform: Returns the platform information of the Python interpreter.

sys.path: Returns the search path of the Python interpreter.

sys.argv: Returns the command line parameter list.

sys.exit(status): Terminate the running of the Python interpreter and return the status code.

3. Datetime module: Provides the function of processing date and time. For example:

datetime.now(): Returns the current date and time.

datetime.strptime(date_string, format): Convert date string to date object.

datetime.strftime(date_object, format): Convert date object to date string.

datetime.timedelta(days, hours, minutes, seconds): Returns a time interval.

datetime.date(year, month, day): Returns a date object.

datetime.time(hour, minute, second): Returns a time object.

datetime.datetime(year, month, day, hour, minute, second): Returns a datetime object.

4. Math module: Provides many mathematical functions. For example:

math.pi: Returns pi.

math.sqrt(x): Returns the square root of x.

math.sin(x): Returns the sine value of x.

math.cos(x): Returns the cosine value of x.

math.tan(x): Returns the tangent value of x.

math.asin(x): Returns the arcsine of x.

math.acos(x): Returns the arc cosine of x.

math.atan(x): Returns the arctangent value of x.

math.atan2(y, x): Returns the arc tangent of y/x.

math.ceil(x): Returns the smallest integer greater than or equal to x.

math.floor(x): Returns the largest integer less than or equal to x.

math.round(x): Returns the rounded x.

5. Random module: Provides many functions for generating random numbers. For example:

random.randint(a, b): Returns a randomly generated integer between a and b.

random.random(): Returns a randomly generated floating point number between 0 and 1.

random.choice(sequence): Returns a randomly selected element in the sequence.

random.shuffle(sequence): Randomly sort the elements in the sequence.

6. String module: Provides many functions for processing strings. For example:

string.ascii_lowercase: Returns a string containing all lowercase letters.

string.ascii_uppercase: Returns a string containing all uppercase letters.

string.digits: Returns a string containing all digits.

string.octal: Returns a string containing all octal characters.

string.hexadecimal: Returns a string containing all hexadecimal characters.

string.printable: Returns a string containing all printable characters.

string.split(string, sep): Use sep as the separator to split the string into a list.

string.join(iterable, sep): Use sep as the separator to join the elements in iterable into a string.

7. Other modules: There are other Python standard library modules, such as os, sys, datetime, math, random, string, etc., which provide many useful functions. - string.join(iterable, sep): Use sep as the separator to join the elements in iterable into a string.

8. Other modules: There are some other Python standard library modules, such as os, sys, datetime, math, random, string etc., provides many useful features.

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