我试图将过滤后的数据帧传入一个旨在操纵某些列的函数（再次使用过滤）。我知道这已经出现过很多次了，但即使在阅读了文档和其他相关问题之后，我仍然无法解决问题。我想我只需要一个可以开始试验的工作实例。
这是我失败的尝试。 ; pseudo code follows, replace it by actual x86 instructions
; and registers as you wish
; ("r16_something" means one of 16b register, r8 is 8b register)
lea r16_str1,[str1] ; load CPU with address of str1
mov r16_counter,str1size ; load CPU with str1 size value
lea r16_str2,[str2] ; load address of target buffer
loop_per_character:
mov r8_char,[r16_str1] ; read single character
cmp r8_char,'0'
jne skip_non_ascii_zero_char
; the character is equal to ASCII '0' character (value 48)
mov r8_char,'O' ; replace it with 'O'
skip_non_ascii_zero_char:
; here the character was modified as needed, write it to str2 buffer
mov [r16_str2],r8_char
; make both str1/2 pointers to point to next character
inc r16_str1
inc r16_str2
; count down the counter, and loop until zero is reached
dec r16_counter
jnz loop_per_character
; the memory starting at "str2" should now contain
; modified copy of "str1"
; ... add exit instructions ...
将是从我的实际用例传递给列操作函数的值。
s1答案 0 :(得分：0)
我认为你应该使用函数.ix
例如：
df1.ix[df1['a']<=2, 'b'] = 0
你想实现吗？