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Makefile test if variable is not empty In a makefile I'm trying to I've created this simplified makefile to demonstrate my problem. Neither make a or make b executes the body of the if, I don't understand why not. make a make b .PHONY: a b a: $(eval MY_VAR = $(shell echo whatever)) @echo MY_VAR is $(MY_VAR) $(info $(MY_VAR)) ifneq ($(strip $(MY_VAR)),) @echo "should be executed" endif @echo done b: $(eval MY_VAR = $(shell echo '')) @echo MY_VAR is $(MY_VAR) $(info $(MY_VAR)) ifneq ($(strip $(MY_VAR)),) @echo "should not be executed" endif @echo done I'm using $ make --version GNU Make 3.81 There are several problems, and misunderstandings. Your MY_VAR is a make variable, set it without a <tab> to its value, and no need to $(eval ...) . MY_VAR:=$(shell echo whatever) is enough. No <tab> before $(info ...) neither, this is make – Zelnes

"Palace Music" redirects here. For the racehorse, see Palace Music (horse). Bonnie 'Prince' Billy Will Oldham, June 6, 2009 Background information Birth name William Oldham Also known as Palace Brothers Palace Music Bonnie 'Prince' Billy Born ( 1970-12-24 ) December 24, 1970 (age 47) Louisville, Kentucky, United States Genres Folk alternative country country freak folk [1] Years active 1993–present Labels Drag City, Domino, Spunk Associated acts Dawn McCarthy, The Cairo Gang, Mekons, Matt Sweeney, Mick Turner, Tortoise, Trembling Bells, Harem Scarem, The Picket Line, Alex Neilson, Björk, Slint Website www.bonnieprincebilly.com Will Oldham (born December 24, 1970), better known by the stage name Bonnie 'Prince' Billy , is an American singer-songwriter and actor. From 1993 to 1997, he performed and recorded under variations of the Palace name, including the Palace Brothers, Palace Songs, and Palace Music. After releasing material under his own name,

Clash Royale CLAN TAG #URR8PPP 'Series' object is not callable Error / Statsmodels illegal variable name Update: You can download my dataset here. I am running a simple OLS regression with statsmodels and pandas dataframe as following: import statsmodels.formula.api as sm import pandas as pd df=pd.read_csv("exp.csv") #df is a dataframe that I have containing many variable names such as AAPL, SPY, INF, etc. for column in df: result=sm.ols(formula="SPY"+" ~ "+column, data=df).fit() However, one of the column name in df is INF . I guess maybe INF is a reserved word for pasty, the code gives me the following error: INF INF Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/ap248/.local/easybuild/software/2017/Core/miniconda2/4.3.27/lib/python2.7/site-packages/statsmodels/base/model.py", line 155, in from_formula missing=missing) File "/home/ap248/.local/easybuild/softw