DEV Community

Super Kai (Kazuya Ito)
Super Kai (Kazuya Ito)

Posted on

String in Python (14)

Buy Me a Coffee

*Memos:


isdecimal() < isdigit() < isnumeric(). *True is returned for more numeric strings as going from the left to the right.


isdecimal() can check if a string only has decimal characters and isn't empty as shown below. *It has no arguments:

print('12345'.isdecimal()) # Lowercase Arabic Numeral print('12345'.isdecimal()) # Uppercase Arabic Numeral print('١٢٣٤٥'.isdecimal()) # 12345 (Eastern Arabic Numeral) # True  print('¹²³⁴⁵'.isdecimal()) # 12345 (Superscript Arabic Numeral) print('₁₂₃₄₅'.isdecimal()) # 12345 (Subscript Arabic Numeral) print(''.isdecimal()) # 12 (Lowercase Roman Numeral) print(''.isdecimal()) # 12 (Uppercase Roman Numeral) print('十二'.isdecimal()) # 12 (Japanese Kanji Numeral) print('壱弐'.isdecimal()) # 12 (Japanese Kanji Numeral) print('-12345'.isdecimal()) print('1 2 3 4 5'.isdecimal()) # With spaces print('1.2345'.isdecimal()) print('1,2345'.isdecimal()) print('1.23+4.5j'.isdecimal()) print('xii'.isdecimal()) # 12 (Lowercase Alphabet) print('XII'.isdecimal()) # 12 (Uppercase Alphabet) print(''.isdecimal()) # False  # Extra print('①②③④⑤'.isdecimal()) print('⓵⓶⓷⓸⓹'.isdecimal()) print('❶❷❸❹❺'.isdecimal()) print('➊➋➌➍➎'.isdecimal()) print('⑴⑵⑶⑷⑸'.isdecimal()) print('⒈⒉⒊⒋⒌'.isdecimal()) print('1⃣2⃣3⃣4⃣5⃣'.isdecimal()) # False 
Enter fullscreen mode Exit fullscreen mode

isdigit() can check if a string only has digital characters and isn't empty as shown below. *It has no arguments:

print('12345'.isdigit()) # Lowercase Arabic Numeral print('12345'.isdigit()) # Uppercase Arabic Numeral print('١٢٣٤٥'.isdigit()) # 12345 (Eastern Arabic Numeral) print('¹²³⁴⁵'.isdigit()) # 12345 (Superscript Arabic Numeral) print('₁₂₃₄₅'.isdigit()) # 12345 (Subscript Arabic Numeral) # True  print(''.isdigit()) # 12 (Lowercase Roman Numeral) print(''.isdigit()) # 12 (Uppercase Roman Numeral) print('十二'.isdigit()) # 12 (Japanese Kanji Numeral) print('壱弐'.isdigit()) # 12 (Japanese Kanji Numeral) print('-12345'.isdigit()) print('1 2 3 4 5'.isdigit()) # With spaces print('1.2345'.isdigit()) print('1,2345'.isdigit()) print('1.23+4.5j'.isdigit()) print('xii'.isdigit()) # 12 (Lowercase Alphabet) print('XII'.isdigit()) # 12 (Uppercase Alphabet) print(''.isdigit()) # False  # Extra print('①②③④⑤'.isdigit()) print('⓵⓶⓷⓸⓹'.isdigit()) print('❶❷❸❹❺'.isdigit()) print('➊➋➌➍➎'.isdigit()) print('⑴⑵⑶⑷⑸'.isdigit()) print('⒈⒉⒊⒋⒌'.isdigit()) # True  print('1⃣2⃣3⃣4⃣5⃣'.isdigit()) # False 
Enter fullscreen mode Exit fullscreen mode

isnumeric() can check if a string only has numeric characters and isn't empty as shown below. *It has no arguments:

print('12345'.isnumeric()) # Lowercase Arabic Numeral print('12345'.isnumeric()) # Uppercase Arabic Numeral print('١٢٣٤٥'.isnumeric()) # 12345 (Eastern Arabic Numeral) print('¹²³⁴⁵'.isnumeric()) # 12345 (Superscript Arabic Numeral) print('₁₂₃₄₅'.isnumeric()) # 12345 (Subscript Arabic Numeral) print(''.isnumeric()) # 12 (Lowercase Roman Numeral) print(''.isnumeric()) # 12 (Uppercase Roman Numeral) print('十二'.isnumeric()) # 12 (Japanese Kanji Numeral) print('壱弐'.isnumeric()) # 12 (Japanese Kanji Numeral) # True  print('-12345'.isnumeric()) print('1 2 3 4 5'.isnumeric()) # With spaces print('1.2345'.isnumeric()) print('1,2345'.isnumeric()) print('1.23+4.5j'.isnumeric()) print('xii'.isnumeric()) # 12 (Lowercase Alphabet) print('XII'.isnumeric()) # 12 (Uppercase Alphabet) print(''.isnumeric()) # False  # Extra print('①②③④⑤'.isnumeric()) print('⓵⓶⓷⓸⓹'.isnumeric()) print('❶❷❸❹❺'.isnumeric()) print('➊➋➌➍➎'.isnumeric()) print('⑴⑵⑶⑷⑸'.isnumeric()) print('⒈⒉⒊⒋⒌'.isnumeric()) # True  print('1⃣2⃣3⃣4⃣5⃣'.isnumeric()) # False 
Enter fullscreen mode Exit fullscreen mode

Top comments (0)