Regular expression is not working in python script

Question

the regular expression is not working. please find the below details.

cpu_pattern = re.compile('.*CPU.*(usr|user).*nice.*sys.*')

part = b'11:40:24 AM     CPU      %usr     %nice      %sys   %iowait    %steal      %irq     %soft    %guest     %idle\n11:40:25 AM     all      0.00      0.00      0.08      0.00      0.00      0.00      0.00      0.00     99.92'

IF condition:

if cpu_pattern.search(part): if cpu_usage == '': cpu_usage == part

Error:

TypeError('cannot use a string pattern on a bytes-like object')

As the error says, You `'cannot use a string pattern on a bytes-like object'`. Your search-pattern is a string, the `part` variable is bytes. — Hampus Larsson, Jul 17 '20 at 08:29
@ipj That doesn’t work. You need to *decode* the byte sequence. — Konrad Rudolph, Jul 17 '20 at 10:24
Right, however `cpu_pattern.search(str(part))' returns `` with no error the result is wrong. Use: `part.decode("utf-8")` — ipj, Jul 17 '20 at 11:16
tp_count = len(time_points) xtick_label_stepsize = tp_count / 15 if xtick_label_stepsize == 0: xtick_label_stepsize = 1 self.x_data = range(tp_count) self.xticks = np.arange(0, tp_count, xtick_label_stepsize) self.xtick_labels = [self.x_data[i] for i in self.xticks] Error : range indices must be integers or slices, not numpy.float64 — nallapayan 420, Jul 20 '20 at 08:58

score 1 · Answer 1 · answered Jul 17 '20 at 09:10

Please use below code to convert byte to string in python which will solve your issue:

part= part.decode("utf-8")

Put above code after part obejct

Output print(part):

11:40:24 AM     CPU      %usr     %nice      %sys   %iowait    %steal      %irq     %soft    %guest     %idle                         
11:40:25 AM     all      0.00      0.00      0.08      0.00      0.00      0.00      0.00      0.00     99.92

score 0 · Answer 2 · answered Jul 17 '20 at 10:26

0

part is not a string, it’s a byte sequence. You now have two choices; which is more appropriate depends on how part was generated:

Perform byte-wise matching rather than string matching, by using a byte sequence pattern:
```
cpu_pattern = re.compile(b'.*CPU.*(usr|user).*nice.*sys.*')
```
Decode the parts byte sequence using an appropriate encoding, e.g. UTF-8:
```
parts_str = parts.decode('utf-8')
```

answered Jul 17 '20 at 10:26

Konrad Rudolph

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**cpu_usage += "\n" + part ** Can only concatenate str (not "bytes") to str – nallapayan 420 Jul 21 '20 at 07:29

Regular expression is not working in python script

2 Answers2