otp.string#
- class string#
Bases:
str
OneTick data type representing string with length and varstring. To set string length use
__getitem__
. If the length is not set then theDEFAULT_LENGTH
length is used by default. In this case usingotp.string
is the same as usingstr
. If the length is set to Ellipse it represents varstring. Varstring is used for returning variably sized strings.Note
If you try to set value with length x to string[y] and x > y, value will be truncated to y length.
Examples
>>> t = otp.Tick(A='a') >>> t = t.table(A=otp.string[10]) >>> t.schema {'A': string[10]}
Example of truncation column value to set string length.
>>> t['A'] *= 100 >>> t['B'] = t['A'].str.len() >>> otp.run(t) Time A B 0 2003-12-01 aaaaaaaaaa 10
Example of string with default length.
>>> t = otp.Tick(A='a') >>> t['A'] *= 100 >>> t['B'] = t['A'].str.len() >>> otp.run(t) Time A B 0 2003-12-01 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 64
Setting Ellipsis as length represents varstring.
>>> t = otp.Tick(A='a') >>> t = t.table(A=otp.string[...]) >>> t.schema {'A': varstring}
Varstring length is multiplied.
>>> t['A'] *= 65 >>> t['B'] = t['A'].str.len() >>> otp.run(t) Time A B 0 2003-12-01 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 65
otp.varstring is a shortcut:
>>> t = otp.Tick(A='a') >>> t = t.table(A=otp.varstring) >>> t.schema {'A': varstring}
- Variables
DEFAULT_LENGTH (int) – default length of the string when the length is not specified
- DEFAULT_LENGTH = 64#