Question

我正在尝试按python分类。似乎由于某种原因没有分组

使用python 2.7

#!/usr/bin/env python
counts = {}
logfile = open("/tmp/test.out", "r")

for line in logfile:
    if line.startswith("20") in line:
        seq = line.strip()
        substr = seq[0:13]
        if substr not in counts:
            counts[substr] = 0
            counts[substr] += 1
            for substr, count in counts.items():
                print(count,substr)

我想要下面的输出，按计数分组

 6 2019-06-17T00
 13 2019-06-17T01
  9 2019-06-17T02
  7 2019-06-17T03
  6 2019-06-17T04

Answer 1

您的子字符串增量缩进了一个块

for line in logfile:
    if line.startswith("20") in line:
        seq = line.strip()
        substr = seq[0:13]
        if substr not in counts:
            counts[substr] = 0
        # Un-indented below
        counts[substr] += 1

# Print output only after loop completes
for substr, count in counts.items():
    print(count,substr)

如果子字符串不在count字典中，则只能进行递增操作。

Answer 2

counts = {}
logfile = open("/tmp/test.out", "r")

for line in logfile:
    if line.startswith("20") in line:
        seq = line.strip()
        substr = seq[0:13]
        if substr not in counts:
            counts[substr] = 0
        counts[substr] += 1
for substr, count in counts.items():
    print(count,substr)

我认为这会起作用

分组并在python中计数

2 个答案: