python - 名称错误 : name 'ptclType' is not defined

Question

我是Python初学者。当我尝试运行下面的代码时，它给出了 NameError。代码的目的是打印 readline 中的单词。我搜索了一些有关此问题的论坛，但找不到合适的解决方案。看来该变量没有出现在 if 语句之外。

import sys
f = open("./multPhiCorr_741_25nsDY_cfi.py",'r')
lines = f.readlines()
if line.find('name') != -1:
    Section = line[23:-4]       # slice charactor index
    print ('[%s]') % Section
if line.find('type') != -1:
    ptclType = line[21:-3]      # slice charactor index
if line.find('varType') != -1:
    nameParVar = line[24:-3]    # slice charactor index
if line.find('fx') != -1:
    formula = line[21:-3]       # slice charactor index
if line.find('etaMin') != -1:
    netaMin = line[24:-3]       # slice charactor index
print ('{%s 1 eta 1 %s %s}') % (ptclType,nameParVar,formula)

[/u/user/sangilpark/pytest]$ python convert.py
Traceback (most recent call last):
  File "convert.py", line 19, in <module>
   print ('{%s 1 eta 1 %s %s}') % (ptclType,nameParVar,formula)
NameError: name 'ptclType' is not defined

Answer 1

ptclType 仅在满足条件“if”语句时才定义。因此，当您尝试打印它时，它没有被定义。首先尝试分配默认值:

import sys
f = open("./multPhiCorr_741_25nsDY_cfi.py",'r')
lines = f.readlines()
ptclType = None
nameParVar = None
formula = None
if line.find('name') != -1:
    Section = line[23:-4]       # slice charactor index
    print ('[%s]') % Section
if line.find('type') != -1:
    ptclType = line[21:-3]      # slice charactor index
if line.find('varType') != -1:
    nameParVar = line[24:-3]    # slice charactor index
if line.find('fx') != -1:
    formula = line[21:-3]       # slice charactor index
if line.find('etaMin') != -1:
    netaMin = line[24:-3]       # slice charactor index
print ('{%s 1 eta 1 %s %s}') % (ptclType,nameParVar,formula)

如您所见，我只是使用默认值(在顶部)定义了 print 语句中的所有内容，以防不满足“if”语句。