1 字符串信息函数
1.1 numpy.char.count
Example:
c = np.array(['aAaAaA', ' aA ', 'abBABba'])
print(c)
print(np.char.count(c, 'A'))
print(np.char.count(c, 'aA'))
print(np.char.count(c, 'A', start=1, end=4))
print(np.char.count(c, 'A', start=1, end=3))
"""
['aAaAaA' ' aA ' 'abBABba']
[3 1 1]
[3 1 0]
[2 1 1]
[1 0 0]
"""
Example:
print(np.char.endswith(['Blair','Jane'],'r'))
print(np.char.endswith(['Blair','Jane'],'r',start=1,end=2))
print(np.char.endswith(['Blair','Jane'],'r',start=3,end=5))
s = np.array(['foo', 'bar'])
print(np.char.endswith(s, 'ar'))
print(np.char.endswith(s, 'a', start=1, end=2))
"""
[ True False]
[False False]
[ True False]
[False True]
[False True]
"""
Example:
s = ['Blair','Jane',"Lee"]
print(np.char.find(s,'J'))
print(np.char.find(s,'a'))
print(np.char.find(s,'e',start=0,end=2))
"""
[-1 0 -1]
[ 2 1 -1]
[-1 -1 1]
"""
Example:
s = ['JBlaJir','JaJne',"Lee"]
print(np.char.rfind(s,'J'))
print(np.char.rfind(s,'a'))
print(np.char.rfind(s,'e',start=0,end=2))
"""
[ 4 2 -1]
[ 3 1 -1]
[-1 -1 1]
"""
Example:
s = ['Blair','Jane',"Lee"]
print(np.char.index(s,'J'))
print(np.char.index(s,'a'))
print(np.char.index(s,'e',start=0,end=2))
"""
ValueError
ValueError
ValueError
"""
s = ['Blaie','Jane',"Lee"]
print(np.char.index(s,'e',start=0,end=2))
"""
ValueError
"""
s = ['Blaie','Jane',"Lee"]
print(np.char.index(s,'e',start=0,end=5))
"""
[4 3 1]
"""
numpy.char.rindex
char.rindex(a, sub, start=0, end=None)
与 rfind
类似,但在未找到子字符串 sub
时引发 ValueError
。
Example:
s = ['JBlaJire','JaJne',"JaLee"]
print(np.char.rindex(s,'J'))
print(np.char.rindex(s,'a'))
print(np.char.rindex(s,'e',start=0,end=2))
"""
[ 4 2 -1]
[ 3 1 -1]
ValueError
"""
char.isalpha(a)
如果字符串中的所有字符都是字母并且至少有一个字符,则为每个元素返回 true
,否则返回 false
。
Example:
s = ['Blaie','1111',"Lee"]
print(np.char.isalpha(s))
s = ['Blaie1','反差萌',"Lee"]
print(np.char.isalpha(s))
s = ['Blaie1','#####',"Lee"]
print(np.char.isalpha(s))
"""
[ True False True]
[False True True]
[False False True]
"""
Example:
s = ['Blaie','1111',"Lee"]
print(np.char.isalnum(s))
s = ['Blaie1','反差萌',"Lee"]
print(np.char.isalnum(s))
s = ['Blaie1','#####',"Lee"]
print(np.char.isalnum(s))
"""
[ True True True]
[ True True True]
[ True False True]
"""
char.isdecimal(a)
对于每个元素,如果元素中只有十进制字符,则返回 True
。
Example:
s = ['Blaie','1111',"Lee"]
print(np.char.isdecimal(s))
s = ['Blaie1','反差萌',"Lee"]
print(np.char.isdecimal(s))
s = ['Blaie1','#####',"Lee"]
print(np.char.isdecimal(s))
s = ['1.1111','1+2j',"Lee"]
print(np.char.isdecimal(s))
"""
[False True False]
[False False False]
[False False False]
[ True False False]
"""
1.8 numpy.char.isdigit
char.isdigit(a)
如果字符串中的所有字符都是数字并且至少有一个字符,则为每个元素返回 true
,否则返回 false
。
Example:
s = ['Blaie','1111',"Lee007",'1.11','1+1j','反差萌','###']
print(np.char.isdigit(s))
"""
[False True False False False False False]
"""
1.9 numpy.char.islower
char.islower(a)
如果字符串中的所有大小写字符都是小写并且至少有一个大小写字符,则为每个元素返回 true
,否则返回 false
。
Example:
s = ['Blaie','1111',"Lee007",'1.11','1+1j','反差萌','###','abc','ABC','1+2j#']
print(np.char.islower(s))
"""
[False False False False True False False True False True]
"""
char.isnumeric(a)
对于每个元素,如果元素中只有数字字符,则返回 True
。
Example:
s = ['Blaie','1111',"Lee007",'1.11','1+1j','反差萌','###','abc','ABC','1+2j#']
print(np.char.isnumeric(s)) #只有全是数字时返回True
"""
[False True False False False False False False False False]
"""
char.isspace(a)
如果字符串中只有空白字符并且至少有一个字符,则为每个元素返回 true
,否则返回 false
。
Example:
s = ['Blaie','1111',"Lee007",'1.11','1+1j','反差萌','###','abc','ABC','1+2j#','',' ','\t']
print(np.char.isspace(s)) #只有全是空白字符且至少有一个时返回True
"""
[False False False False False False False False False False False True True]
"""
Example:
s = ['T','Blaie','1111',"Lee007",'1.11','1+1j','反差萌','###','abc','ABC','1+2j#','',' ','\t']
print(np.char.istitle(s)) #只有全是空白字符且至少有一个时返回True
"""
[ True True False True False False False False False False False False
False False]
"""
char.isupper(a)
如果字符串中的所有大小写字符都是大写并且至少有一个字符,则为每个元素返回 true
,否则返回 false
。
Example:
s = ['T','Blaie','1111',"Lee007",'1.11','1+1j','反差萌','###','abc','ABC','1+2j#','',' ']
print(np.char.isupper(s)) #只有全是空白字符且至少有一个时返回True
i = 0
for tmp in np.char.isupper(s):
print('%-6s -> %-5s'%(s[i],tmp))
i = i+1
"""
[ True False False False False False False False False True False False
False]
T -> True
Blaie -> False
1111 -> False
Lee007 -> False
1.11 -> False
1+1j -> False
反差萌 -> False
### -> False
abc -> False
ABC -> True
1+2j# -> False
-> False
-> False
"""
Example:
print(np.char.startswith(['Blair','Jane'],'r'))
print(np.char.startswith(['Blair','Jane'],'r',start=1,end=2))
print(np.char.startswith(['Blair','Jane'],'r',start=3,end=5))
s = np.array(['foo', 'bar'])
print(np.char.startswith(s, 'ar'))
print(np.char.startswith(s, 'a', start=1, end=2))
"""
[False False]
[False False]
[False False]
[False False]
[False True]
"""
char.str_len(a)
返回 len(a)
元素。
Example:
s = ['T','Blaie','1111',"Lee007",'1.11','1+1j','反差萌','###','abc','ABC','1+2j#','',' ']
print(np.char.str_len(s))
"""
[1 5 4 6 4 4 3 3 3 3 5 0 1]
"""
__EOF__