def validate_isin(isin):
"""
Validate an ISIN
"""
if (len(isin) == 12 and isin[:2] in NUMBERING_AGENCIES.keys()
and isin_checksum(isin[:11]) == isin[11]):
return True
else:
return False
def validate_isin(isin):
"""
Validate an ISIN
"""
if len(isin) == 12 \
and isin[:2] in NUMBERING_AGENCIES.keys() \
and isin_checksum(isin[:11]) == isin[12]:
return True
else:
return False
def cusip2isin(cusip, nation=None):
# Validate inputs
if not validate_cusip(cusip):
raise ValueError("'%s' is not a valid CUSIP" % cusip)
nation = nation or "US"
if nation not in NUMBERING_AGENCIES.keys():
raise ValueError("'%s' is not a valid country code" % nation)
# Construct ISIN
base = nation + cusip
return base + isin_checksum(base)
def cusip2isin(cusip: str, nation: Optional[str] = None) -> str:
# Validate inputs
if not validate_cusip(cusip):
raise ValueError("'%s' is not a valid CUSIP" % cusip)
nation = nation or "US"
if nation not in NUMBERING_AGENCIES.keys():
raise ValueError("'%s' is not a valid country code" % nation)
# Construct ISIN
base = nation + cusip
return base + isin_checksum(base)
def validate_isin(isin: str) -> bool:
"""
Validate an ISIN
"""
if (
len(isin) == 12
and isin[:2] in NUMBERING_AGENCIES.keys()
and isin_checksum(isin[:11]) == isin[11]
):
return True
else:
return False
def cusip2isin(cusip, nation=None):
# Validate inputs
if not validate_cusip(cusip):
raise ValueError("'%s' is not a valid CUSIP" % cusip)
nation = nation or 'US'
if nation not in NUMBERING_AGENCIES.keys():
raise ValueError("'%s' is not a valid country code" % nation)
# Construct ISIN
base = nation + cusip
return base + ISINchecksum(base)
def isin_checksum(base):
"""
Compute the check digit for a base International Securities Identification
Number (ISIN). Input an 11-char alphanum str, output a single-char str.
http://goo.gl/8kPzD
"""
assert len(base) == 11
assert base[:2] in NUMBERING_AGENCIES.keys()
check = ''.join([str(int(char, 36)) for char in base])
check = check[::-1] # string reversal
check = ''.join([d if n % 2 else str(int(d)*2) for n, d in enumerate(check)])
return str((10 - sum([int(d) for d in check]) % 10) % 10)
def isin_checksum(base: str) -> str:
"""
Compute the check digit for a base International Securities Identification
Number (ISIN). Input an 11-char alphanum str, output a single-char str.
http://goo.gl/8kPzD
"""
assert len(base) == 11
assert base[:2] in NUMBERING_AGENCIES.keys()
check = "".join([str(int(char, 36)) for char in base])
check = check[::-1] # string reversal
check = "".join([d if n % 2 else str(int(d) * 2) for n, d in enumerate(check)])
return str((10 - sum([int(d) for d in check]) % 10) % 10)
