isascii, isspace, isprintable & isidentifier in Python

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*Memo:

• My post explains string, bytes and bytearray functions.

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

*Memo:

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

<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.

<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