Python int转换为二进制字符串？

#1 楼

>>> "{0:b}".format(37)
'100101'

#2 楼

>>> bin(10)
'0b1010'

#3 楼

define intToBinString, receiving intVal:
    if intVal is equal to zero:
        return "0"
    set strVal to ""
    while intVal is greater than zero:
        if intVal is odd:
            prefix "1" to strVal
        else:
            prefix "0" to strVal
        divide intVal by two, rounding down
    return strVal

#4 楼

 get_bin = lambda x: format(x, 'b')

print(get_bin(3))
>>> '11'

print(get_bin(-3))
>>> '-11'
 

 get_bin = lambda x, n: format(x, 'b').zfill(n)
>>> get_bin(12, 32)
'00000000000000000000000000001100'
>>> get_bin(-12, 32)
'-00000000000000000000000000001100'
 

def get_bin(x, n=0):
    """
    Get the binary representation of x.

    Parameters
    ----------
    x : int
    n : int
        Minimum number of digits. If x needs less digits in binary, the rest
        is filled with zeros.

    Returns
    -------
    str
    """
    return format(x, 'b').zfill(n)

#5 楼

def toBinary(n):
    return ''.join(str(1 & int(n) >> i) for i in range(64)[::-1])

#6 楼

>> "{0:b}".format(10)
'1010'

>> "{0:{fill}8b}".format(10, fill='0')
'00001010'

'{0:{fill}{width}b}'.format((x + 2**n) % 2**n, fill='0', width=n)

#7 楼

print(format(0, '08b'))

#8 楼

>>> binary = lambda n: '' if n==0 else binary(n/2) + str(n%2)

>>> binary(5)
'101'

t1 = time()
for i in range(1000000):
     binary(i)
t2 = time()
print(t2 - t1)
# 6.57236599922

t1 = time()
for i in range(1000000):
    '{0:b}'.format(i)
t2 = time()
print(t2 - t1)
# 0.68017411232

#9 楼

integer = 7
bit_count = 5
print(f'{integer:0{bit_count}b}')

#10 楼

n=42
assert  "-101010" == format(-n, 'b')
assert  "-101010" == "{0:b}".format(-n)
assert  "-101010" == (lambda x: x >= 0 and str(bin(x))[2:] or "-" + str(bin(x))[3:])(-n)
assert "0b101010" == bin(n)
assert   "101010" == bin(n)[2:]   # But this won't work for negative numbers.

#11 楼

>>> format(123, 'b')
'1111011'

#12 楼

def int2bin(integer, digits):
    if integer >= 0:
        return bin(integer)[2:].zfill(digits)
    else:
        return bin(2**digits + integer)[2:]

>>> int2bin(10, 8)
'00001010'
>>> int2bin(-10, 8)
'11110110'
>>> int2bin(-128, 8)
'10000000'
>>> int2bin(127, 8)
'01111111'

#13 楼

>>> number = 1
>>> f'0b{number:08b}'
'0b00000001'

>>> x, y, z = 1, 2, 3
>>> f'{x} {y} {2*z}'
'1 2 6'

>>> f'{z:b}'
'11'

>>> f'{z:8b}'
'      11'

f'{z:08b}'
'00000011'

>>> f'0b{z:08b}'
'0b00000011'

#14 楼

Examples
--------
>>> a = np.array([[2], [7], [23]], dtype=np.uint8)
>>> a
array([[ 2],
       [ 7],
       [23]], dtype=uint8)
>>> b = np.unpackbits(a, axis=1)
>>> b
array([[0, 0, 0, 0, 0, 0, 1, 0],
       [0, 0, 0, 0, 0, 1, 1, 1],
       [0, 0, 0, 1, 0, 1, 1, 1]], dtype=uint8)

#15 楼

bin(10)[2:]

f = str(bin(10))
c = []
c.append("".join(map(int, f[2:])))
print c

#16 楼

#17 楼

def int2bin(val):
    res=''
    while val>0:
        res += str(val&1)
        val=val>>1     # val=val/2 
    return res[::-1]   # reverse the string

def int2bin(val):
   res=''
   while val>0:
       res = chr((val&1) + 0x30) + res
       val=val>>1    
   return res 

#18 楼

def binary(decimal) :
    otherBase = ""
    while decimal != 0 :
        otherBase  =  str(decimal % 2) + otherBase
        decimal    //=  2
    return otherBase

print binary(10)

#19 楼

name = 'Bob'
number = 42
f"Hello, {name}, your number is {number:>08b}"

#20 楼

def inttobinary(number):
  if number == 0:
    return str(0)
  result =""
  while (number != 0):
      remainder = number%2
      number = number/2
      result += str(remainder)
  return result[::-1] # to invert the string

#21 楼

n=input()
print(bin(n).replace("0b", ""))

#22 楼

>>> np.binary_repr(3)
'11'
>>> np.binary_repr(-3)
'-11'
>>> np.binary_repr(3, width=4)
'0011'

>>> np.binary_repr(-3, width=3)
'101'
>>> np.binary_repr(-3, width=5)
'11101'

#23 楼

def to_bin(dec):
    flag = True
    bin_str = ''
    while flag:
        remainder = dec % 2
        quotient = dec / 2
        if quotient == 0:
            flag = False
        bin_str += str(remainder)
        dec = quotient
    bin_str = bin_str[::-1] # reverse the string
    return bin_str 

#24 楼

def dectobin(number):
    bin = ''
    while (number >= 1):
        number, rem = divmod(number, 2)
        bin = bin + str(rem)
    return bin

#25 楼

def toBin(num):
  if num == 0:
    return ""
  return toBin(num//2) + str(num%2)

print ([(toBin(i)) for i in range(10)])

['', '1', '10', '11', '100', '101', '110', '111', '1000', '1001']

#26 楼

# CONVERTER: DEC / BIN / HEX

def dec2bin(d):
    # dec -> bin
    b = bin(d)
    return b

def dec2hex(d):
    # dec -> hex
    h = hex(d)
    return h

def bin2dec(b):
    # bin -> dec
    bin_numb="{0:b}".format(b)
    d = eval(bin_numb)
    return d,bin_numb

def bin2hex(b):
    # bin -> hex
    h = hex(b)
    return h

def hex2dec(h):
    # hex -> dec
    d = int(h)
    return d

def hex2bin(h):
    # hex -> bin
    b = bin(h)
    return b


## TESTING NUMBERS
numb_dec = 99
numb_bin = 0b0111 
numb_hex = 0xFF


## CALCULATIONS
res_dec2bin = dec2bin(numb_dec)
res_dec2hex = dec2hex(numb_dec)

res_bin2dec,bin_numb = bin2dec(numb_bin)
res_bin2hex = bin2hex(numb_bin)

res_hex2dec = hex2dec(numb_hex)
res_hex2bin = hex2bin(numb_hex)



## PRINTING
print('------- DECIMAL to BIN / HEX -------\n')
print('decimal:',numb_dec,'\nbin:    ',res_dec2bin,'\nhex:    ',res_dec2hex,'\n')

print('------- BINARY to DEC / HEX -------\n')
print('binary: ',bin_numb,'\ndec:    ',numb_bin,'\nhex:    ',res_bin2hex,'\n')

print('----- HEXADECIMAL to BIN / HEX -----\n')
print('hexadec:',hex(numb_hex),'\nbin:    ',res_hex2bin,'\ndec:    ',res_hex2dec,'\n')

#27 楼

print("Binary is {0:>08b}".format(16))

print("Hexa Decimal is {0:>0x}".format(15))

for i in range(17):
   print("{0:>2}: binary is {0:>08b}".format(i))

 for i in range(17):
    print("{0:>2}: Hexa Decimal is {0:>0x}".format(i))
##as 2 digit is enogh for hexa decimal representation of a number

#28 楼

try:
    while True:
        p = ""
        a = input()
        while a != 0:
            l = a % 2
            b = a - l
            a = b / 2
            p = str(l) + p
        print(p)
except:
    print ("write 1 number")

#29 楼

#30 楼

binary_string = format(value, '0{}b'.format(width))