数据没有打印到文件中，导致文件为空
Data does not print into the file, resulting in a empty file
我一直在尝试将此数据写入“scenario_out.txt”文件。然而，当我 运行 代码时，我没有得到任何错误，但我的文本文件确实变空了，所以没有数据被放入文件中。 .我正在复习我的笔记，但我没有看到哪里做错了。
# Display results of scenario
def file_save_flow(save_to_file, # save to a file object if save_to_file = True
file_object, # name of file object to save to
scen_year,
age,
s_bal,
bal_pv,
inv_gains,
ann_savings,
ss_payment,
major_inc,
major_exp,
tax_rate,
tar_ret_spend,
net_ret_spend,
ret_pre_tax_spend,
taxes,
end_bal
):
""" file_save_flow() test output
>>> out_file = open("scenario_out.txt","w")
>>> 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
... )
>>> out_file.close()
>>> in_file = open("scenario_out.txt","r")
>>> print(in_file.read())
Year :0
Age :60
Start Bal :100,000.00
Start Bal PV :100,000.00
Invest Gains :1,000.00
Ann Savings :1,000.00
SS Payment :1,000.00
Major Inc :1,000.00
Major Exp :1,000.00
Tax Rate :15.00%
Targ Ret Spend :50,000.00
Net Ret Spend :40,000.00
Ret Pre-tax Spend:60,000.00
Taxes :10,000.00
End Bal :120,000.00
<BLANKLINE>
>>> in_file.close()
"""
#=============================My Code================================
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')))
#============================================================================
# test function
out_file = open("scenario_out.txt","w") # set up the file object to write to
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
)
out_file.close()
in_file = open("scenario_out.txt","r") # read back the contents saved to the file
print(in_file.read())
in_file.close()
我绑定了一些 bool 变量用作标志，但仍然没有成功。
如果你去掉所有的绒毛，你的代码看起来就像这样：
def file_save_flow(save_to_file, file_object, data):
if save_to_file == True:
print('Data: ', data)
out_file = open("scenario_out.txt", "w")
file_save_flow(save_to_file=True, file_object=out_file, data='data')
out_file.close()
in_file = open("scenario_out.txt", "r")
print(in_file.read())
in_file.close()
由此，很明显您的函数只做一件事：如果 save_to_file 是 True，它会打印一些东西，否则什么也不打印。它对 file_object.
没有任何作用
因此，尽管您创建并打开了一个文件并将文件句柄传递给您的函数，但您实际上并没有在 print() 语句中使用它。
这可行：
def file_save_flow(save_to_file, file_object, data):
if save_to_file == True:
print('Data: ', data, file=file_object)
else:
print('Data: ', data)
或者，为了避免重复自己：
def file_save_flow(save_to_file, file_object, data):
print('Data: ', data, file=file_object if save_to_file else None)
目前，您只是将输出打印到控制台，而不是实际将其保存到文件中。
你可能想要这样的东西
if save_to_file == True:
output = (
' Year : ' + str(scen_year) +
'\n Age : ' + str(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_object.write(output)
这会创建一个大的输出数据字符串，然后将其写入文件对象。
我一直在尝试将此数据写入“scenario_out.txt”文件。然而，当我 运行 代码时，我没有得到任何错误，但我的文本文件确实变空了，所以没有数据被放入文件中。 .我正在复习我的笔记，但我没有看到哪里做错了。
# Display results of scenario
def file_save_flow(save_to_file, # save to a file object if save_to_file = True
file_object, # name of file object to save to
scen_year,
age,
s_bal,
bal_pv,
inv_gains,
ann_savings,
ss_payment,
major_inc,
major_exp,
tax_rate,
tar_ret_spend,
net_ret_spend,
ret_pre_tax_spend,
taxes,
end_bal
):
""" file_save_flow() test output
>>> out_file = open("scenario_out.txt","w")
>>> 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
... )
>>> out_file.close()
>>> in_file = open("scenario_out.txt","r")
>>> print(in_file.read())
Year :0
Age :60
Start Bal :100,000.00
Start Bal PV :100,000.00
Invest Gains :1,000.00
Ann Savings :1,000.00
SS Payment :1,000.00
Major Inc :1,000.00
Major Exp :1,000.00
Tax Rate :15.00%
Targ Ret Spend :50,000.00
Net Ret Spend :40,000.00
Ret Pre-tax Spend:60,000.00
Taxes :10,000.00
End Bal :120,000.00
<BLANKLINE>
>>> in_file.close()
"""
#=============================My Code================================
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')))
#============================================================================
# test function
out_file = open("scenario_out.txt","w") # set up the file object to write to
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
)
out_file.close()
in_file = open("scenario_out.txt","r") # read back the contents saved to the file
print(in_file.read())
in_file.close()
我绑定了一些 bool 变量用作标志，但仍然没有成功。
如果你去掉所有的绒毛，你的代码看起来就像这样：
def file_save_flow(save_to_file, file_object, data):
if save_to_file == True:
print('Data: ', data)
out_file = open("scenario_out.txt", "w")
file_save_flow(save_to_file=True, file_object=out_file, data='data')
out_file.close()
in_file = open("scenario_out.txt", "r")
print(in_file.read())
in_file.close()
由此，很明显您的函数只做一件事：如果 save_to_file 是 True，它会打印一些东西，否则什么也不打印。它对 file_object.
因此，尽管您创建并打开了一个文件并将文件句柄传递给您的函数，但您实际上并没有在 print() 语句中使用它。
这可行：
def file_save_flow(save_to_file, file_object, data):
if save_to_file == True:
print('Data: ', data, file=file_object)
else:
print('Data: ', data)
或者，为了避免重复自己：
def file_save_flow(save_to_file, file_object, data):
print('Data: ', data, file=file_object if save_to_file else None)
目前，您只是将输出打印到控制台，而不是实际将其保存到文件中。
你可能想要这样的东西
if save_to_file == True:
output = (
' Year : ' + str(scen_year) +
'\n Age : ' + str(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_object.write(output)
这会创建一个大的输出数据字符串，然后将其写入文件对象。