isascii, isspace, isprintable & isidentifier in Python

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*Memo for string, bytes and bytearray functions:

• My post explains isdecimal(), isdigit() and isnumeric().
• My post explains isalpha() and isalnum().
• My post explains iskeyword() and issoftkeyword().
• My post explains encode() and decode().

*Memo for a string, bytes and bytearray:

• My post explains a string.
• My post explains a bytes.
• My post explains a bytearray.

str.isascii() and bytes.isascii() or bytearray.isascii() can check if the string and bytes or bytearray respectively only have one or more ASCII characters and bytes and are empty as shown below:

*Memo:

• Each has no arguments.

<String>:

print('John Smith'.isascii())
print('Python3'.isascii())
print(''.isascii())
# True

print('Jφhи Sмiтh'.isascii())
# False

<Bytes & Bytearray>:

print(b'John Smith'.isascii())
print(bytearray(b'John Smith').isascii())
print(b'Python3'.isascii())
print(bytearray(b'Python3').isascii())
print(b''.isascii())
print(bytearray(b'').isascii())
# True

print("Lёт's gφ!".encode().isascii())
print(b"L\xd1\x91\xd1\x82's g\xcf\x86!".isascii())
print(bytearray(b"L\xd1\x91\xd1\x82's g\xcf\x86!").isascii())
# False

str.isspace() and bytes.isspace() or bytearray.isspace() can check if the string and bytes or bytearray respectively only have one or more ASCII whitespace characters and bytes and aren't empty as shown below:

*Memo:

• Each has no arguments.
• My post explains line boundaries.

<String>:

print(' '.isspace())
print('    '.isspace())
print('\t\n\r\v\x0b\f\x0c'.isspace())
print('\x1c\x1d\x1e\x85\u2028\u2029'.isspace())
# True

print('Python 3'.isspace())
print(''.isspace())
# False

<Bytes & Bytearray>:

print(b' '.isspace())
print(bytearray(b' ').isspace())
print(b'    '.isspace())
print(bytearray(b'    ').isspace())
# True

print('\t\n\r\v\x0b\f\x0c'.encode().isspace())
print(b'\t\n\r\x0b\x0b\x0c\x0c'.isspace())
print(bytearray(b'\t\n\r\x0b\x0b\x0c\x0c').isspace())
# True

print('\x1c\x1d\x1e\x85\u2028\u2029'.encode().isspace())
print(b'\x1c\x1d\x1e\xc2\x85\xe2\x80\xa8\xe2\x80\xa9'.isspace())
print(bytearray(b'\x1c\x1d\x1e\xc2\x85\xe2\x80\xa8\xe2\x80\xa9').isspace())
# False

print(b'Python 3'.isspace())
print(bytearray(b'Python 3').isspace())
print(b''.isspace())
print(bytearray(b'').isspace())
# False

str.isprintable() can check if the string only has one or more printable characters and is empty as shown below:

*Memo:

• It has no arguments.
• bytes.isprintable() and bytearray.isprintable() don't exist for a bytes and bytearray respectively.

<String>:

print('Hello World'.isprintable())
print('I\'m John'.isprintable())
print(''.isprintable())
# True

print('Hello\tWorld'.isprintable())
print('Hello\nWorld'.isprintable())
# False

print('I\'m John')
# I'm John

print('Hello\tWorld')
# Hello   World

print('Hello\nWorld')
# Hello
# World

str.isidentifier() can check if the string is a valid identifier in Python according to Identifiers and keywords and isn't empty as shown below:

*Memo:

• It has no arguments.
• bytes.isidentifier() and bytearray.isidentifier() don't exist for a bytes and bytearray respectively.

<String>:

print('True_100'.isidentifier())
print('tRuE_100'.isidentifier())
print('_True100'.isidentifier())
print('True100_'.isidentifier())
print('True'.isidentifier())
print('class'.isidentifier())
print('def'.isidentifier())
# True

print('True-100'.isidentifier())
print('100_True'.isidentifier())
print(''.isidentifier())
# False