Python，捕获文本文件中的值

我有一个文件（fluiddynamic代码的输出），其中我希望在以

m longest开头的行后面写入值

以下是相关线路的报告：

 dilute dimensional Zimm longest relaxation time, dil_chtime=
    3.29486769328041

到目前为止，我只写了这句话：
但我不知道为什么它没有捕捉到值3.2948676932

 zimm = 0.
  with open('memo.dat','r') as f:
        for line in f.readlines() :
            if(line.startswith(' dilute dimensional Zimm longest')):
                print (line)
                zimm = f.readline() # I suppose that this read the next line
             else:
                pass

此帧的输出为：
最长弛豫时间，dil_chtime=
如何获取值？
memo.dat:

dilute dimensional Zimm longest relaxation time, dil_chtime=

    3.29486769328041

Python 2.x：

zimm = 0.
nextLine = False     # a boolean flag to get the next line
with open('memo.dat', 'r') as f:
    content = f.readlines()    
    # you may also want to remove empty lines
    content = [l.strip() for l in content if l.strip()]
    for line in content:
        try:
            if (line.startswith('dilute dimensional Zimm longest')):
                nextLine = not nextLine
            elif nextLine:
                print(line)
                nextLine = not nextLine
        except StopIteration:
            pass

3.29486769328041

输出：

zimm = 0.
nextLine = False     # a boolean flag to get the next line
with open('memo.dat', 'r') as f:
    content = f.readlines()    
    # you may also want to remove empty lines
    content = [l.strip() for l in content if l.strip()]
    for line in content:
        try:
            if (line.startswith('dilute dimensional Zimm longest')):
                nextLine = not nextLine
            elif nextLine:
                print(line)
                nextLine = not nextLine
        except StopIteration:
            pass

3.29486769328041

Python 3.x：

zimm = 0.
nextLine = False     # a boolean flag to get the next line
with open('memo.dat', 'r') as f:
    content = f.readlines()    
    # you may also want to remove empty lines
    content = [l.strip() for l in content if l.strip()]
    for line in content:
        try:
            if (line.startswith('dilute dimensional Zimm longest')):
                nextLine = not nextLine
            elif nextLine:
                print(line)
                nextLine = not nextLine
        except StopIteration:
            pass

3.29486769328041

使用
next（）
：

memo.dat：

dilute dimensional Zimm longest relaxation time, dil_chtime=

    3.29486769328041

Python 2.x：

zimm = 0.
nextLine = False     # a boolean flag to get the next line
with open('memo.dat', 'r') as f:
    content = f.readlines()    
    # you may also want to remove empty lines
    content = [l.strip() for l in content if l.strip()]
    for line in content:
        try:
            if (line.startswith('dilute dimensional Zimm longest')):
                nextLine = not nextLine
            elif nextLine:
                print(line)
                nextLine = not nextLine
        except StopIteration:
            pass

3.29486769328041

输出：

zimm = 0.
nextLine = False     # a boolean flag to get the next line
with open('memo.dat', 'r') as f:
    content = f.readlines()    
    # you may also want to remove empty lines
    content = [l.strip() for l in content if l.strip()]
    for line in content:
        try:
            if (line.startswith('dilute dimensional Zimm longest')):
                nextLine = not nextLine
            elif nextLine:
                print(line)
                nextLine = not nextLine
        except StopIteration:
            pass

3.29486769328041

Python 3.x：

zimm = 0.
nextLine = False     # a boolean flag to get the next line
with open('memo.dat', 'r') as f:
    content = f.readlines()    
    # you may also want to remove empty lines
    content = [l.strip() for l in content if l.strip()]
    for line in content:
        try:
            if (line.startswith('dilute dimensional Zimm longest')):
                nextLine = not nextLine
            elif nextLine:
                print(line)
                nextLine = not nextLine
        except StopIteration:
            pass

3.29486769328041

使用
next（）
：

您可以使用
next（f）
获取下一行

Ex:

with open('memo.dat') as f:
    for line in f:     #Iterate Each Line
        if line.strip().startswith('dilute dimensional Zimm longest'): #Check Condition
            print(next(f))     #Get Value
            break

您可以使用
next（f）
获取下一行

Ex:

with open('memo.dat') as f:
    for line in f:     #Iterate Each Line
        if line.strip().startswith('dilute dimensional Zimm longest'): #Check Condition
            print(next(f))     #Get Value
            break

您应该改为执行
zimm=f.next（）
。@RickM。首先，这是行不通的，因为文件已经被
f.readlines（）
完全读取了，其次，你真的应该做
next（f）
，因为它与python 3兼容。@Aran Fey True，谢谢！您应该改为执行
zimm=f.next（）
。@RickM。首先，这是行不通的，因为文件已经被
f.readlines（）
完全读取了，其次，你真的应该做
next（f）
，因为它与python 3兼容。@Aran Fey True，谢谢！您好，您不应该在循环的每次迭代之前放置
nextLine=False
？因为这样它也可以用于多行。@Vaibhavgusain是的，但是在
else
块中。非常感谢。您好，您不应该在循环的每次迭代之前放置
nextLine=False
？因为这样它也可以用于多行。@Vaibhavgusain是的，但是在
else
块中。非常感谢。