Python写入scenario_out.txt无报错但文件为空问题求助

• Python内置的print()函数默认输出到控制台，你虽然在函数入参里接收了待写入的文件对象file_object，但调用print()时没有指定file参数，所有内容都只输出到了终端，没有写入scenario_out.txt文件，所以最终生成的文件为空。

直接修改代码中调用print()的部分，添加file=file_object参数即可，修改后的代码片段如下：

if save_to_file == True:
    print(' Year              :'  , scen_year, 
      '\n Age               :',age,
      '\n Start Bal         :', (format(s_bal, ',.2f')) ,
      '\n Start Bal PV      :', (format(bal_pv, ',.2f')), 
      '\n Invest Gains      :', (format(inv_gains, ',.2f')),
      '\n Ann Savings       :', (format(ann_savings,',.2f')),
      '\n SS Payment        :', (format(ss_payment, ',.2f')),
      '\n Major Inc         :', (format(major_inc, ',.2f')),
      '\n Major Exp         :', (format(major_exp, ',.2f')),
      '\n Tax Rate          :', (format(tax_rate, '.2%')), 
      '\n Targ Ret Spend    :', (format(tar_ret_spend, ',.2f')),
      '\n Net Ret Spend     :', (format(net_ret_spend, ',.2f')),
      '\n Ret Pre-tax Spend :', (format(ret_pre_tax_spend, ',.2f')), 
      '\n Taxes             :', (format(taxes, ',.2f')), 
      '\n End Bal           :', (format(end_bal, ',.2f')),
      file=file_object)

• 操作文件时优先使用with上下文管理器，会自动完成文件关闭、缓冲区刷新操作，不需要手动调用close()，避免因忘记关闭文件导致的写入内容丢失问题，示例写法：

# 测试代码优化后写法
with open("scenario_out.txt","w") as out_file:
    file_save_flow(save_to_file      = True,
                   file_object       = out_file,
                   scen_year         = 0,
                   age               = 60,
                   s_bal             = 100000,
                   bal_pv            = 100000,
                   inv_gains         = 1000,
                   ann_savings       = 1000,
                   ss_payment        = 1000,
                   major_inc         = 1000,
                   major_exp         = 1000,
                   tax_rate          = 0.15,
                   tar_ret_spend     = 50000,
                   net_ret_spend     = 40000,
                   ret_pre_tax_spend = 60000,
                   taxes             = 10000,
                   end_bal           = 120000
                   )

with open("scenario_out.txt","r") as in_file:
    print(in_file.read())

内容的提问来源于stack exchange，提问作者Diesel